ignore Modules/python.exp for AIX (autogenerated)

[isidentical]

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[isidentical]

cpython/Misc/README.AIX

Lines 113 to 119 in e42b705

	AIX shared libraries require that an "export" and "import" file be
	provided at compile time to list all extern symbols which may be
	shared between modules. The "export" file (named python.exp) for the
	modules and the libraries that belong to the Python core is created by
	the "makexp_aix" script before performing the link of the python
	binary. It lists all global symbols (exported during the link) of the
	modules and the libraries that make up the python executable.