configure: Fix enabling memalign_hack automatically

simd_align_16 is a configure item that can be enabled or disabled,
it's not a variable containing a list of other configure items
as need_memalign previously. This was broken in eba2233b5.

CC: libav-stable@libav.org
Signed-off-by: Martin Storsjö <martin@martin.st>
avcodec/libvorbisenc: Give CODEC_CAP_SMALL_LAST_FRAME to libvorbis encoder.

The libvorbis encoder already supports a small last frame, but the layer
above doesn't know that because we didn't register the small last frame
capability.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
Merge commit '7813e6752bdab38a5686c301e869ee71d97bce69'

* commit '7813e6752bdab38a5686c301e869ee71d97bce69':
  configure: Fix enabling memalign_hack automatically

Conflicts:
	configure

See: 3d93ba562243b6d8afac3c875c05304d41da94bf
Merged-by: Michael Niedermayer <michaelni@gmx.at>
doc/writing_filters: use a more portable sed command in the walk-through
doc/writing_filters: fix reference to Lenna image