ffmpeg build fails only if being built as a dependency of emby-server

[Jan Beich]

Ben Woods <woodsb02 at gmail.com> writes:

>> [root at crystal ~]# make -C /usr/ports/multimedia/emby-server/ install
>> clean BATCH=yes 2>&1 | tee -a emby_fail.txt
>> ...
>> libavcodec/libavcodec.so: undefined reference to `ff_blockdsp_init_x86'
>> gmake[2]: *** [Makefile:131: ffprobe_g] Error 1
>> gmake[2]: *** Waiting for unfinished jobs....
>> libavcodec/libavcodec.so: undefined reference to `ff_xvid_idct_init_x86'
>> libavcodec/libavcodec.so: undefined reference to `ff_me_cmp_init_x86'
>> libavfilter/libavfilter.so: undefined reference to `ff_hqdn3d_init_x86'
>> libavcodec/libavcodec.so: undefined reference to `ff_h264_pred_init_x86'
>> libavfilter/libavfilter.so: undefined reference to `ff_showcqt_init_x86'
>> libavcodec/libavcodec.so: undefined reference to
>> `ff_mpegvideoencdsp_init_x86'
>> libavfilter/libavfilter.so: undefined reference to `ff_w3fdif_init_x86'
>> libavutil/libavutil.so: undefined reference to `ff_get_cpu_flags_x86'
>> libavcodec/libavcodec.so: undefined reference to `ff_pixblockdsp_init_x86'
>> cc: error: linker command failed with exit code 1 (use -v to see

Probably a regression from https://svnweb.freebsd.org/changeset/ports/428896
which would be fixed after https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=215401