Bug#574625: liquidsoap: Please enable SDL support

[Petter Reinholdtsen <pere@hungry.com>]

I hoped it was enough to build-depend on the needed library.  To test,
I tried to install libsdl-ocaml-dev and rebuild liquidsoap, but this
fail with the following error:

OCAMLC -c outputs/sdl_out.ml
File "outputs/sdl_out.ml", line 39, characters 10-67:
Error: This class expression is not a class structure; it has type
       infallible:bool ->
       on_start:(unit -> unit) -> on_stop:(unit -> unit) -> Output.output
make[3]: *** [outputs/sdl_out.cmx] Error 2
make[3]: Leaving directory `/home/guest/src/liquidsoap-0.9.2/src'
make[2]: *** [all-auto-ocaml-prog] Error 2
make[2]: Leaving directory `/home/guest/src/liquidsoap-0.9.2/src'
make[1]: *** [all-subdirs] Error 2
make[1]: Leaving directory `/home/guest/src/liquidsoap-0.9.2'
make: *** [debian/stamp-makefile-build] Error 2
dpkg-buildpackage: error: debian/rules build gave error exit status 2
debuild: fatal error at line 1330:

I guess the code is broken and need to be fixed first. :(

Happy hacking,
-- 
Petter Reinholdtsen