gh-121268: remove workarounds for non-IEEE 754 systems in cmath

[skirpichev]

as now building Python now requires support of IEEE 754 floating point numbers.

• Issue: Remove remnants of support for non-IEEE 754 systems from cmathmodule.c #121268

[bedevere-bot]

🤖 New build scheduled with the buildbot fleet by @vstinner for commit 470a59d 🤖

If you want to schedule another build, you need to add the 🔨 test-with-buildbots label again.

[vstinner]

LGTM if buildbots are happy with this change.

[skirpichev]

No failures, related to this pr.

[vstinner]

Merged, thanks.

[bedevere-bot]

⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

Hi! The buildbot iOS ARM64 Simulator 3.x has failed when building commit b6e745a.

What do you need to do:

1. Don't panic.
2. Check the buildbot page in the devguide if you don't know what the buildbots are or how they work.
3. Go to the page of the buildbot that failed (https://buildbot.python.org/#builders/1380/builds/1044) and take a look at the build logs.
4. Check if the failure is related to this commit (b6e745a) or if it is a false positive.
5. If the failure is related to this commit, please, reflect that on the issue and make a new Pull Request with a fix.

You can take a look at the buildbot page here:

https://buildbot.python.org/#builders/1380/builds/1044

Failed tests:

• test_socketserver

Failed subtests:

• test_UnixDatagramServer - test.test_socketserver.SocketServerTest.test_UnixDatagramServer

Summary of the results of the build (if available):

==

Click to see traceback logs

Traceback (most recent call last):
  File "/Users/buildbot/Library/Developer/XCTestDevices/308B4A23-E523-4924-9000-9F41F1B67884/data/Containers/Bundle/Application/3D26E792-C5B1-443D-B867-3B732664079A/iOSTestbed.app/python/lib/python3.14/test/test_socketserver.py", line 222, in test_UnixDatagramServer
    self.run_server(socketserver.UnixDatagramServer,
    ~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
                    socketserver.DatagramRequestHandler,
                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
                    self.dgram_examine)
                    ^^^^^^^^^^^^^^^^^^^
  File "/Users/buildbot/Library/Developer/XCTestDevices/308B4A23-E523-4924-9000-9F41F1B67884/data/Containers/Bundle/Application/3D26E792-C5B1-443D-B867-3B732664079A/iOSTestbed.app/python/lib/python3.14/test/support/threading_helper.py", line 66, in decorator
    return func(*args)
  File "/Users/buildbot/Library/Developer/XCTestDevices/308B4A23-E523-4924-9000-9F41F1B67884/data/Containers/Bundle/Application/3D26E792-C5B1-443D-B867-3B732664079A/iOSTestbed.app/python/lib/python3.14/test/test_socketserver.py", line 133, in run_server
    testfunc(svrcls.address_family, addr)
    ~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/buildbot/Library/Developer/XCTestDevices/308B4A23-E523-4924-9000-9F41F1B67884/data/Containers/Bundle/Application/3D26E792-C5B1-443D-B867-3B732664079A/iOSTestbed.app/python/lib/python3.14/test/test_socketserver.py", line 160, in dgram_examine
    buf = data = receive(s, 100)
                 ~~~~~~~^^^^^^^^
  File "/Users/buildbot/Library/Developer/XCTestDevices/308B4A23-E523-4924-9000-9F41F1B67884/data/Containers/Bundle/Application/3D26E792-C5B1-443D-B867-3B732664079A/iOSTestbed.app/python/lib/python3.14/test/test_socketserver.py", line 43, in receive
    raise RuntimeError("timed out on %r" % (sock,))
RuntimeError: timed out on <socket.socket fd=34, family=1, type=2, proto=0, laddr=./test_python_7aihzq4p.sock>


Traceback (most recent call last):
  File "/Users/buildbot/Library/Developer/XCTestDevices/308B4A23-E523-4924-9000-9F41F1B67884/data/Containers/Bundle/Application/3D26E792-C5B1-443D-B867-3B732664079A/iOSTestbed.app/python/lib/python3.14/threading.py", line 1041, in _bootstrap_inner
    self.run()
    ~~~~~~~~^^
  File "/Users/buildbot/Library/Developer/XCTestDevices/308B4A23-E523-4924-9000-9F41F1B67884/data/Containers/Bundle/Application/3D26E792-C5B1-443D-B867-3B732664079A/iOSTestbed.app/python/lib/python3.14/threading.py", line 992, in run
    self._target(*self._args, **self._kwargs)
    ~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/buildbot/Library/Developer/XCTestDevices/308B4A23-E523-4924-9000-9F41F1B67884/data/Containers/Bundle/Application/3D26E792-C5B1-443D-B867-3B732664079A/iOSTestbed.app/python/lib/python3.14/socketserver.py", line 240, in serve_forever
    self._handle_request_noblock()
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^
  File "/Users/buildbot/Library/Developer/XCTestDevices/308B4A23-E523-4924-9000-9F41F1B67884/data/Containers/Bundle/Application/3D26E792-C5B1-443D-B867-3B732664079A/iOSTestbed.app/python/lib/python3.14/socketserver.py", line 320, in _handle_request_noblock
    self.handle_error(request, client_address)
    ~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/buildbot/Library/Developer/XCTestDevices/308B4A23-E523-4924-9000-9F41F1B67884/data/Containers/Bundle/Application/3D26E792-C5B1-443D-B867-3B732664079A/iOSTestbed.app/python/lib/python3.14/socketserver.py", line 318, in _handle_request_noblock
    self.process_request(request, client_address)
    ~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/buildbot/Library/Developer/XCTestDevices/308B4A23-E523-4924-9000-9F41F1B67884/data/Containers/Bundle/Application/3D26E792-C5B1-443D-B867-3B732664079A/iOSTestbed.app/python/lib/python3.14/socketserver.py", line 349, in process_request
    self.finish_request(request, client_address)
    ~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/buildbot/Library/Developer/XCTestDevices/308B4A23-E523-4924-9000-9F41F1B67884/data/Containers/Bundle/Application/3D26E792-C5B1-443D-B867-3B732664079A/iOSTestbed.app/python/lib/python3.14/socketserver.py", line 362, in finish_request
    self.RequestHandlerClass(request, client_address, self)
    ~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/buildbot/Library/Developer/XCTestDevices/308B4A23-E523-4924-9000-9F41F1B67884/data/Containers/Bundle/Application/3D26E792-C5B1-443D-B867-3B732664079A/iOSTestbed.app/python/lib/python3.14/socketserver.py", line 763, in __init__
    self.finish()
    ~~~~~~~~~~~^^
  File "/Users/buildbot/Library/Developer/XCTestDevices/308B4A23-E523-4924-9000-9F41F1B67884/data/Containers/Bundle/Application/3D26E792-C5B1-443D-B867-3B732664079A/iOSTestbed.app/python/lib/python3.14/socketserver.py", line 858, in finish
    self.socket.sendto(self.wfile.getvalue(), self.client_address)
    ~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
ConnectionResetError: [Errno 54] Connection reset by peer
ERROR