[PATCH] Use AC_PROG_PATHS for Python

[Ray Donnelly]

I'm working on building clang/llvm in MSYS2 where, in it's latest
incarnation python2.exe exists in /usr/bin but python.exe doesn't. The
configury incorrectly uses AC_PROG_PATH instead of AC_PROG_PATHS when
searching for a Python executable in the list [python python2
python26] and so doesn't find python2.

This patch fixes this.
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