gh-122681: remove m_atan2()/c_atan2() helpers

[skirpichev]

• Issue: Merge m_atan2() and c_atan2() helper functions (or replace libm's atan2) #122681

[vstinner]

Can you rebase/merge your branch to avoid the merge conflict? Then I can run buildbots on this PR.

[bedevere-bot]

🤖 New build scheduled with the buildbot fleet by @vstinner for commit a4aff45 🤖

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

[skirpichev]

No failures, related to this pr.

[vstinner]

LGTM.

@skirpichev: Did you just create to see if removing the wrapper would work or not, or do you propose to remove it?

[skirpichev]

Yeah, I think we can remove it; testing with buildbots - for additional safety. But it's not urgent and I would appreciate @mdickinson blessing.

Current workarounds fix only few functions in cmath. Missing bugreports - another indication, that underlying problems were fixed on affected systems.

[bedevere-bot]

🤖 New build scheduled with the buildbot fleet by @kumaraditya303 for commit 11a6f3d 🤖

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