pkgconfig: fix gstreamer-plugins-base-1.0 .pc files for no OpenGL case
Don't put gl into the libraries list if the gst-gl library isn't being built, and also don't include it in the list of linker flags then.
Fixes #613 (closed)
Don't put gl into the libraries list if the gst-gl library isn't being built, and also don't include it in the list of linker flags then.
Fixes #613 (closed)