opengl32: it does not compile well in CYGWIN and MINGW

[Carlo Bramini]

When compiling openg32 under CYGWIN and MINGW, the compiler complains that the 
public functions have been redeclared without dllimport keyword. This happens 
because WINGDIAPI from wingdi.h is not correctly declared.
This bug can be fixed by adding declaration of _GDI32_ macro in the Makefile.
in, as it had been already done for dlls/gdi32 component.

Sincerely,

Carlo Bramini.
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