fluidsynth: added "experimental" comments in the source file

INSTALL

@@ -99,7 +99,7 @@ libsidplay2 - http://sidplay2.sourceforge.net/
 For C64 SID support.
 
 libfluidsynth - http://fluidsynth.resonance.org/
-For MIDI support.
+For MIDI support (DO NOT USE - use libwildmidi instead)
 
 libwildmidi - http://wildmidi.sourceforge.net/
 For MIDI support.

src/decoder/fluidsynth_plugin.c

@@ -17,6 +17,15 @@
  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */
 
+/*
+ * WARNING!  This plugin suffers from major shortcomings in the
+ * libfluidsynth API, which render it practically unusable.  For a
+ * discussion, see the post on the fluidsynth mailing list:
+ *
+ * http://www.mail-archive.com/fluid-dev@nongnu.org/msg01099.html
+ *
+ */
+
 #include "../decoder_api.h"
 #include "../timer.h"
 #include "../conf.h"