Reduce __attribute__(x) to nothing if __GNUC__ is unset

[Vincent Béron]

This lets us get rid of various #ifdef __GNUC__, as well as use
DECLSPEC_NORETURN at least everywhere winnt.h is included, without fear
of conflicts.

Would this be better placed in wine/port.h?

Changelog:
Reduce __attribute__(x) to nothing if not on GCC.

Vincent
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