Unbreak shout.pc (on non-GNU systems)
The pkgconfig file shout.pc contains a list of requirements starting with an empty value:
Requires.private: , ogg, vorbis, theora, speex, libssl
This is not well-formed and doesn't work with pkgconfig on OpenBSD (for example). Since libogg is a must-have dependency, the simple fix is to just start the list with it.