Allow local use of `static PyMutex` in the C analyzer

[ZeroIntensity]

As seen with gh-127055, the C analyzer doesn't like static local variables, but it's fine to do so for a PyMutex. If we want to use a similar approach for other libc functions (as mentioned in gh-127081), it would be better to gracefully handle this instead of adding to ignored.tsv every time.

[vstinner]

Can you rebase your PR on the main branch and remove:

diff --git a/Tools/c-analyzer/cpython/ignored.tsv b/Tools/c-analyzer/cpython/ignored.tsv
index 4327a111eed..686f3935d91 100644
--- a/Tools/c-analyzer/cpython/ignored.tsv
+++ b/Tools/c-analyzer/cpython/ignored.tsv
@@ -739,7 +739,6 @@ Modules/expat/xmlrole.c     -       declClose       -
 Modules/expat/xmlrole.c        -       error   -

 ## other
-Modules/grpmodule.c    grp_getgrall_impl       getgrall_mutex  -
 Modules/_io/_iomodule.c        -       _PyIO_Module    -
 Modules/_sqlite/module.c       -       _sqlite3module  -
 Modules/clinic/md5module.c.h   _md5_md5        _keywords       -

[bedevere-app[bot]]

A Python core developer has requested some changes be made to your pull request before we can consider merging it. If you could please address their requests along with any other requests in other reviews from core developers that would be appreciated.

Once you have made the requested changes, please leave a comment on this pull request containing the phrase I have made the requested changes; please review again. I will then notify any core developers who have left a review that you're ready for them to take another look at this pull request.

[ZeroIntensity]

Ok, the ignore from Victor's PR has been removed. I'll do a more thorough audit of what needs to get un-ignored when I'm more available later today.

[ZeroIntensity]

Hmm, this seems like a bedevere bug. This should still have awaiting changes per Eric's review, not awaiting merge.

[ZeroIntensity]

Did a search, and it looks like no other mutexes need to get un-ignored. We're good to merge.

[vstinner]

Merged, thanks.