I fixed the bug that was in my previous attempt of this cleanup. I ran
the full test suite to verify I didn't introduce any obvious bugs.

This test requires the ifconfig executable on $PATH, /sbin/, or /usr/sbin.

This test requires the ifconfig executable on $PATH, /sbin/, or /usr/sbin.

pythoncore sub-project.  This should prevent build errors due a previous
build's python(_d).exe still running.

pythoncore sub-project.  This should prevent build errors due a previous
build's python(_d).exe still running.

of the time.  Patch by Julian Gindi.

virtual interface.  Original patch by Kent Frazier.

virtual interface.  Original patch by Kent Frazier.

Issue #19638: Raise ValueError instead of crashing when converting billion character strings to float.

Change stacklevel in warnings.warn() for 'SO' key to 2.

with traceback_limit=1

Regression introduced by the implementation of the PEP 446 (non-inheritable
file descriptors by default).

master_fd must be set non-inheritable after the creation of the slave_fd,
otherwise grantpt(master_fd) fails with EPERM (errno 13).