configure: Fix floating point conformance ith icl.

Reviewed-by: Reimar Döffinger <Reimar.Doeffinger@gmx.de>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
lavc: Add an internal wrapper around get_format()

It will be useful in the following commits.
avcodec/cinepakenc: use av_malloc_array()

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
avcodec/dct: use av_malloc_array()

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
Merge commit '632ad2248e2e5d8cd4b51e6c87c943a38c3da425'

* commit '632ad2248e2e5d8cd4b51e6c87c943a38c3da425':
  lavc: Add an internal wrapper around get_format()

Conflicts:
	libavcodec/h264_slice.c
	libavcodec/mpeg12dec.c

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