[flac-dev] problems with configure.ac

[lvqcl]

1) in config.h FLAC__HAS_X86INTRIN macro is always defined and empty,
even if x86intrin.h is not available.



2) sse_os is defined as 'yes' or 'no', but AM_CONDITIONAL tests it for 'true':

AM_CONDITIONAL(FLaC__SSE_OS, test "x$sse_os" = xtrue)

It seems that it should be changed to

AM_CONDITIONAL(FLaC__SSE_OS, test "x$sse_os" = xyes)



3) configure --disable-sse  prints:
"    SSE optimizations : ................... no"
but this option actually doesn't disable SSE, so this message
is a bit misleading.

(Also, maybe it's better to rename --(dis|en)able-sse ?)