[Mesa-dev] [Merge request #362]scons: Fix MSYS2 Mingw-w64 build (toolchain=mingw)

[Liviu Prodea]

This patch is based on https://github.com/msys2/MINGW-packages/blob/master/mingw-w64-mesa/link-ole32.patch but with tweaks to avoid MSVC build break when applied.

There is a caveat to this patch though, it doesn't help swr driver.
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