A long-standing bug in a gtk-fortran example with Intel compilers

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I use “!DEC$ ATTRIBUTES STDCALL,REFERENCE,ALIAS:‘hello’, DLLEXPORT :: hello” for intel, so to enable using both you would need a macro like:

#ifdef __GNUC__
   !GCC$ ATTRIBUTES DLLEXPORT :: hello
#else
   !DEC$ ATTRIBUTES STDCALL,REFERENCE,ALIAS:'hello', DLLEXPORT :: hello
#endif

the directives should be OS agnostic