display: Include mathematics.h for fallback definition of NAN

This fixes compilation with MSVC.

Signed-off-by: Martin Storsjö <martin@martin.st>
check: add libavcodec/vda_internal.h to SKIPHEADERS-$(CONFIG_VDA)
build: export library dependencies in ${name}_FFLIBS

Removes an ugly $(if) to avoid conflicts with $(FFLIBS-) in the
top-level MAkefile.
lavf: add av_stream_get_side_data
dca: Convert dca_dmixtable to integers

Also include zero in the table, eliminating a special case in the
decoder.

Signed-off-by: Niels Möller <nisse@southpole.se>
Signed-off-by: Anton Khirnov <anton@khirnov.net>
avcodec: bump version after rotation api

Signed-off-by: Kostya Shishkov <kostya.shishkov@gmail.com>
rdt: check malloc calls

Signed-off-by: Anton Khirnov <anton@khirnov.net>
smoothstream: check malloc calls

Signed-off-by: Anton Khirnov <anton@khirnov.net>
WIP: lavf/gif
WIP: lavc/gif
WIP: use av_packet_ref()/unref()