[PATCH] Use AC_PROG_PATHS for Python

[Ray Donnelly]

I've since updated this patch a small bit so that python2 is looked
for before python26 before python to prevent failure when python3 is
python.

A tiny bit of other adjustment crept into configure, but it's just a
whitespace difference that likely should've been included when a
previous change was made to autoconf/configure.ac

Many thanks,

Ray Donnelly.

On Sat, Nov 16, 2013 at 3:35 AM, Ray Donnelly <mingw.android at gmail.com> wrote:
> 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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