[issue12196] add pipe2() to the os module

[Ross Lagerwall]

Ross Lagerwall <rosslagerwall at gmail.com> added the comment:

Out of interest, is there any reason that the configure check for pipe2 is a special case near the bottom of configure.in instead of with all the other function checks in the AC_CHECK_FUNCS[] section in the middle?
I know this patch didn't write the configure check but maybe it could be changed.

Also, the pure python implementation of subprocess for posix can now be updated to use pipe2 if it exists (previously on _posixsubprocess.c used it).

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nosy: +rosslagerwall

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