[x264-devel] Support msys2 in configure

[Stefano Sabatini]

Hi,

the attached two patches allow to successfully configure when building
x264 from a MSYS2 shell (for example the one from
http://www.msys2.org/).

You may wonder why one should build from the MSYS2 shell (rather than
from one of the MinGW* shells): for example when you're building using
CL it makes no difference to build from MSYS2 since the compilation
environment in that case is not the one included by MINGW. This is the
strategy adopted for example by this project:
https://github.com/wingtk/gvsbuild

Bye.
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