[CMake] CMAKE 2.5 MinGW returns bad WIN32

[Gonzalo Garramuño]

I'm running FindOpenGL and FindGLUT on a mingw based compile, with MSYS 
Makefiles and CMAKE_CXX_COMPILER=g++.  That is, a standard GNU build.

FindOpenGL and FindGLUT fail to find the microsoft opengl32.lib and dll 
and the corresponding glut lib.

The problem is that WIN32 returns false.
It is unclear whether to me whether this is correct behavior.  It seems 
like it shouldn't be being that CYGWIN returns true.

-- 
Gonzalo Garramuño
ggarra at advancedsl.com.ar

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