[Ohrrpgce] Windows build failing in surface.cpp

[James Paige]

I just noticed this in the windows nightly build

surface.cpp: In function 'int gfx_surfaceCopy_SW(SurfaceRect*, Surface*,
RGBPalette*, Palette16*, int, SurfaceRect*, Surface*)':
surface.cpp:351:65: error: 'alloca' was not declared in this scope
    pal32 = (RGBcolor*)alloca(pPal8->numcolors * sizeof(RGBcolor));
                                                                 ^
scons: *** [build\surface.o] Error 1
scons: building terminated because of errors
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