configure.ac : Fix FLAC__HAS_X86INTRIN / FLaC__SSE_OS.

* Correct definition of FLAC__HAS_X86INTRIN in config.h file.
* Correct comparison of sse_os with 'true' instead of 'yes'.

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