blargg_source.h inclusion in gme.h is harmful

[sezero]

Public header gme.h includes blargg_source.h only for BLARGG_EXPORT macro.
However blargg_source.h contains macros with not unique names at all, and
they can clash with any users of the library.

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I suggest duplicating BLARGG_EXPORT macro in gme.h and removing inclusion
of blargg_source.h.

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Pull request pending.

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[sezero]

Submitted https://bitbucket.org/mpyne/game-music-emu/pull-requests/39 for this