resolve build problem in cygwin toolchain #2688
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when building using cmake. it defines the macro _GLFW_WIN32 for win32. but the glfw don't recognise the macro. so that the definitions in the win_thread.c .... etc are not defined. so undefined error arise when building a application. This error arises only when using cygwin toolchain. when using mingw, it defines MINGW32 so the glfw recognise it.