[flac-dev] [PATCH 13] cpu.c / cpu_asm.nasm

[lvqcl]

According to docs, it's incorrect to just call CPUID with EAX=1.
One must to ensure that this value is supported.

CPUs that don't support CPUID level 1 are very old, but...
if FLAC tests CPUID presence it should also test CPUID level support.

Also the function FLAC__cpu_have_cpuid_asm_ia32 was simplified
according to the docs at Intel website and in Wikipedia.
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