x86: lavr: use the x86inc.asm automatic stack alignment in mixing functions

CC:libav-stable@libav.org
Merge remote-tracking branch 'qatar/master'

* qatar/master:
  x86: lavr: use the x86inc.asm automatic stack alignment in mixing functions

Merged-by: Michael Niedermayer <michaelni@gmx.at>
alsdec: Consistently use a period at the end of error messages.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
alsdec: Introduce failsafe switch to keep ALSSpecificConfig consistent to the input.

Reveiwed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
cos_tablegen: fix the lack on M_PI

We dont include mathematics.h as the headers get configured by config.h
for the target not the host.

Reviewed-by: Clément Bœsch <ubitux@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
dnxhd: Add avpriv_dnxhd_get_frame_size()

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
mxfenc: avoid depending on private codec structures and functions

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