temporary symbolic link.

Found by LLVM/clang 2.9.

Found by LLVM/clang 2.9.

prevent accidental assignment.

Silences a warning from LLVM/clang 2.9.

always appended to the include directories regardless of whether it
was already in the list of directories. This could cause issue if
sqlite was installed in the same location as another install of
Python. Now a check is done to make sure the directory is not included
twice.

instead of an active loop (while True: pass) to limit race conditions.

Using sets in tests did not check whether the values were written in the right
section or with the right key.

:class:`multiprocessing.Process`.  Also, fix Process.join() to not use
polling anymore, when given a timeout.

Patch by Catalin Iacob.

error if faulthandler.dump_tracebacks_later() is missing (e.g. if Python is
compiled without threads).

Add TESTTIMEOUT variable (default: 3600 seconds). Use TESTTIMEOUT=0 to disable
the timeout.
***
fix

It's unclear what this was referring to; most likely, it was about sockets
that the application had already closed, in which case it's not a sockets
problem, but an application problem.

I chose “setupcfg” as prefix instead of “packaging-setupcfg” because the scope
of the spec is not limited to packaging: it’s intended as a language-agnostic
document for packaging tools developers as well as Python authors.