[3.11] gh-95041: Fix several minor issues in syslog.openlog() (GH-95058)

[miss-islington]

• syslog_get_argv() swallows exceptions, but not in all cases.
• if ident is non UTF-8 encodable, syslog.openlog() fails after setting the
  global reference to ident. Now the C string saved internally in the previous
  call to openlog() points to the freed memory.
• PySys_Audit() can crash if ident is NULL.
• There may be a race condition with syslog.syslog(), because the global
  reference to ident is decrefed before setting the new value.
• Possible use of freed memory if syslog.openlog() is called while
  the GIL is released in syslog.syslog().
  (cherry picked from commit 68c555a)

Co-authored-by: Serhiy Storchaka storchaka@gmail.com

• Issue: syslog issues #95041

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