This adds in any missing symbols that are required due to the use of
"Dead Code Elimination" and thus prevents errors in debug builds due to
unresolved symbols.

Fixes #2

The projects were also changed to be built with the gpl compliant
settings instead on using non-free.

This means that librtmp is no longer required as ffmpegs internal rtmp
code is now used instead. libgmp is now a direct dependency as it is
used for rtmp crypt functions.