[flac-dev] PATCH for encode.c, format_input()

[lvqcl]

MSVS profiler shows that the encoder spends too much time inside format_input()
when the input is 24-bit. The attached patch increases encoding speed:

FLAC -5: from 27.1 to 24.2 seconds
FLAC -8: from 76.2 to 73.1 seconds
(MSVS 2010, 32-bit flac.exe, 24-bit stereo input file)

For GCC compiles the encoding speed remains the same.

I suspect that GCC is smart enough to use strict aliasing rule to
optimize the code, and MSVS doesn't even know about it.
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