Add link_directories() for external libraries
Add link_directories() for external libraries

I have been attempting to build using openh264 library in a non-standard location `/path/to/stage/usr/local/lib` which was failing due to the directory not being included in the linker command. This commit adds required `link_directories()` calls for the third-party dependency libraries.
Benau/libopenglrecorder,Benau/libopenglrecorder