glx: Remove noop dispatch table

We can never hit this, because the indirect GLX dispatch code always
forces a current context and checks that it's non-NULL before calling
into the dispatch table.  If it's _not_ null, then _glapi_set_context
will call into the driver, which is responsible for calling
_glapi_set_dispatch to make sure the dispatch table is non-NULL.

Also remove _glapi_set_warning_func and friends, since we can no longer
call them even from dead code.

Reviewed-by: Dave Airlie <airlied@redhat.com>
Signed-off-by: Adam Jackson <ajax@redhat.com>

hw/xquartz/GL/indirect.c

@@ -681,17 +681,8 @@ GLuint __glFloorLog2(GLuint val)
     return c;
 }
 
-void warn_func(void * p1, char *format, ...) {
-    va_list v;
-    va_start(v, format);
-    vfprintf(stderr, format, v);
-    va_end(v);
-}
-
 static void setup_dispatch_table(void) {
     struct _glapi_table *disp=_glapi_get_dispatch();
-    _glapi_set_warning_func((_glapi_warning_func)warn_func);
-    _glapi_noop_enable_warnings(TRUE);
 
     /* to update:
      * for f in $(grep 'define SET_' ../../../glx/dispatch.h  | cut -f2 -d' ' | cut -f1 -d\( | sort -u); do grep -q $f indirect.c || echo $f ; done | grep -v by_offset | sed 's:SET_\(.*\)$:SET_\1(disp, gl\1)\;:' | pbcopy