Adds join() and task_done() methods to track when all enqueued tasks have
been gotten and fully processed by daemon consumer threads.

Cleanup terminated processes as well.
Add cmd attribute to Popen4.

Rename file -> filename to be clear.

Will backport.

commands. If there are active commands when the tests
start, fail, printing these commands.

child process is closed when the test completes.

and later versions because they bumped the default setting to
get our basic tests to run correctly..

BSD make stops the build when it tries to expand wild cards on empty
directories.

wrt to ssize_t.

to stop truncating it.

Fix crash when a Unicode string containing an encoding declaration is
compile()d. Fixes #1115379.

on 64-bit platforms.

Don't use SEH when compiling wth mingw.
Use IS_INTRESOURCE to determine function name from function ordinal.

Rewrite the code that allocates and frees callback functions, hopefully
this avoids the coverty warnings: Remove the THUNK typedef, and move the
definition of struct ffi_info into the header file.

comments in the file. (SF #1455641)

was used unmotivated in the pow() docs)