qPremultiply(QRgb): let the compiler see all versions

Use a template helper function and template specialization
to select which of the two versions (64bit / 32bit) to
use. This makes the compiler see both versions on all
platforms, enabling better syntax checking should either
of the two change. It also will fail to compile on platforms
where the word size is neither 4 nor eight bytes now...

And, of course, it's always satisfying to remove a use of
the preprocessor.

Change-Id: I4870411f99eb3b1a2c0c170fa53fa3c9b026da15
Reviewed-by: Gunnar Sletta <gunnar@sletta.org>

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