hashsum: Drop non-GNU --bits flag

[RenjiSann]

Split from #9770, needs to be merged after it

cc @oech3

[github-actions]

GNU testsuite comparison:

Congrats! The gnu test tests/printf/printf-surprise is now passing!
Note: The gnu test tests/dd/no-allocate was skipped on 'main' but is now failing.
Note: The gnu test tests/misc/write-errors was skipped on 'main' but is now failing.

[cakebaker]

Is this PR still needed, with #9776 planning to remove hashsum?

[github-actions]

GNU testsuite comparison:

GNU test failed: tests/sort/sort-stale-thread-mem. tests/sort/sort-stale-thread-mem is passing on 'main'. Maybe you have to rebase?

[RenjiSann]

Is this PR still needed, with #9776 planning to remove hashsum?

#9776 depends on this, I wanted to split them since both are pretty big changes by themselves, but I can merge them if you prefer

[github-actions]

GNU testsuite comparison:

Congrats! The gnu test tests/printf/printf-surprise is now passing!
Note: The gnu test tests/dd/no-allocate was skipped on 'main' but is now failing.
Note: The gnu test tests/misc/write-errors was skipped on 'main' but is now failing.

[codspeed-hq]

CodSpeed Performance Report

Merging #9773 will not alter performance

_{Comparing RenjiSann:hashsum-drop-bits (deaf44a) with main (8d3774b)}

Summary

✅ 127 untouched
⏩ 6 skipped¹

Footnotes

1. 6 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

[github-actions]

GNU testsuite comparison:

Skipping an intermittent issue tests/misc/tee (passes in this run but fails in the 'main' branch)

[cakebaker]

Thanks!

[oech3]

I'm not sure. But I think recient commit increased binary size 0.2 MB+.

[RenjiSann]

I'm not sure. But I think recient commit increased binary size 0.2 MB+.

Are you taking about the size of the hashsum or coreutils binary, or both ?
I don't know what in this PR or #9770 might have changed that though 🤔

[oech3]

coreutils. Yes, I should test `UTILS="cksum hashsum"`.