[PATCH] Use mingw alloca macro when defined

Windows
1

My mingw alloca macro is different from the once defined in Juce, causing a warning.
We can just use the mingw one if defined.

Patch here:
https://github.com/DISTRHO/juce/commit/b50d3948bc442fd8bcead00654258a0f5f16d76f.patch

 

2

Thanks, sounds like a sensible change!