[flac-dev] PATCHES for cpu.h/cpu.c

[lvqcl]

The first patch adds SSE4.1/SSE4.2 detection.

The second patch removes union data in struct FLAC__CPUInfo and
replaces it with #ifdefs. Reason: currently it's possible to set or
get data.ia32.sse3 value from x86-64 code, etc. It's a potential
source of errors (at least that's true for me).

(the 2nd patch requires the 1st to be applied)
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