doc: remove licensing claims for chromaprint and libgme

doc/general.texi

@@ -56,13 +56,13 @@ enable it.
 @section Chromaprint
 
 FFmpeg can make use of the Chromaprint library for generating audio fingerprints.
-It is licensed under LGPL version 2.1. Pass @code{--enable-chromaprint} to configure to
+Pass @code{--enable-chromaprint} to configure to
 enable it. See @url{https://acoustid.org/chromaprint}.
 
 @section Game Music Emu
 
 FFmpeg can make use of the Game Music Emu library to read audio from supported video game
-music file formats. It is licensed under LGPL version 2.1. Pass @code{--enable-libgme} to configure to
+music file formats. Pass @code{--enable-libgme} to configure to
 enable it. See @url{https://bitbucket.org/mpyne/game-music-emu/overview}.
 
 @section OpenJPEG