libavcodec57 RPI missing dependency

[David Fries]

Please add missing dependency to libraspberrypi0 otherwise programs
using avcodec can't find libmmal_core.so and fail (unless something
else happens to bring in that dependency).

As of 7:3.2.10-1~deb9u1+rpt1 libavcodec57:armhf is now linked against
libmmal_core.so etc, which is currently not found.

ldd /usr/lib/arm-linux-gnueabihf/libavcodec.so.57
        libmmal_core.so => not found
        libmmal_util.so => not found
        libmmal_vc_client.so => not found
        libbcm_host.so => not found

I found this out after the motion program would no longer run after an
upgrade.  Oddly I had the libraries, but this Raspberry Pi claims they
aren't part of any package.

dpkg --search /opt/vc/lib/libmmal_core.so
dpkg-query: no path found matching pattern /opt/vc/lib/libmmal_core.so

Library path rule, also in libraspberrypi0 wasn't on the system.
/etc/ld.so.conf.d/00-vmcs.conf
contains /opt/vc/lib

-- 
David Fries <david at fries.net>