[HarfBuzz] Patch: fix compilation of harfbuzz with Sun Studio on Solaris

[Ginn Chen]

There're 2 issues.

1) C++ function pointer can not be assigned to C function pointer type without explicit casting.
Instead of adding a lots of casting, I added HB_BEGIN_DECLS/END_DECLS for *nil functions.

2) A union member cannot have a user-defined assignment operator.
Same issue as https://bugzilla.gnome.org/show_bug.cgi?id=602408#c1

Please let me know if the patch is committed on master, then I'll put it back to mozilla-central.

Thanks,

Ginn

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