[flac-dev] Lets do a 1.3.2 release

[lvqcl]

Dave Yeo wrote:

> Seems that the default binutils on OS/2 is too old to support AVX2,
> attached patch works around this. Not the best solution as best would be
> configure tests, but simple.

Are you sure that these binutils support AVX and FMA? (Currently libFLAC
doesn't contain AVX and FMA instructions). If they aren't supported then
it's better to include them too into #if !defined __OS2__ ... #endif.