libFLAC: Fix link error

The function FLAC__cpu_xgetbv_x86() is declared and defined only
if FLAC__HAS_X86INTRIN is defined. However FLAC__cpu_info() was
calling it even if FLAC__HAS_X86INTRIN was undefined,

Patch-from: lvqcl <lvqcl.mail@gmail.com>
1 file changed