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.

This will require all dependencies to be updated to latest version
supporting dynamic c runtime.

This uses the new output lib naming scheme. In order to work all
dependency projects must also be updated to the latest version (the
supplied bat file can be used for this)