gst/goom/Makefile.am: Don't compile lex or yacc outputs with warnings, but add other...

gst/goom/Makefile.am: Don't compile lex or yacc outputs with warnings, but add other CFLAGS

Original commit message from CVS:
* gst/goom/Makefile.am: Don't compile lex or yacc outputs
with warnings, but add other CFLAGS
* gst/goom/goomsl.c (gsl_instr_set_namespace),
(gsl_instr_add_param), (iflow_execute), (gsl_enternamespace),
(calculate_labels), (gsl_read_file):
* gst/goom/goomsl_lex.l:
* gst/goom/goomsl_yacc.y:
* gst/goom/plugin_info.c: Remove a few live printf, and
fprintf, replace exit() calls with g_assert_not_reached()
if it not optimal for a library