flac_parser: check return value of av_fifo_alloc()

Signed-off-by: Paul B Mahol <onemda@gmail.com>
avutil/x86: disable ff_evaluate_lls_sse2() for 32bit

It just segfaults on 32bit, thus its disabled until someone fixes it.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>