trace: Remove unused functions

trace.c:1154: warning: ‘_has_font_face_id’ defined but not used
trace.c:1196: warning: ‘_get_pattern_id’ defined but not used
trace.c:1870: warning: ‘_emit_font_face’ defined but not used
trace.c:1882: warning: ‘_emit_scaled_font’ defined but not used

util/cairo-trace/trace.c

@@ -1150,12 +1150,6 @@ _get_font_face_id (cairo_font_face_t *font_face)
     return _get_id (FONT_FACE, font_face);
 }
 
-static bool
-_has_font_face_id (cairo_font_face_t *font_face)
-{
-    return _has_id (FONT_FACE, font_face);
-}
-
 static void
 _emit_font_face_id (cairo_font_face_t *font_face)
 {
@@ -1192,12 +1186,6 @@ _create_pattern_id (cairo_pattern_t *pattern)
     return obj->token;
 }
 
-static long
-_get_pattern_id (cairo_pattern_t *pattern)
-{
-    return _get_id (PATTERN, pattern);
-}
-
 static void
 _emit_pattern_id (cairo_pattern_t *pattern)
 {
@@ -1866,24 +1854,12 @@ _emit_context (cairo_t *cr)
     _emit_current (_get_object (CONTEXT, cr));
 }
 
-static void
-_emit_font_face (cairo_font_face_t *font_face)
-{
-    _emit_current (_get_object (FONT_FACE, font_face));
-}
-
 static void
 _emit_pattern (cairo_pattern_t *pattern)
 {
     _emit_current (_get_object (PATTERN, pattern));
 }
 
-static void
-_emit_scaled_font (cairo_scaled_font_t *scaled_font)
-{
-    _emit_current (_get_object (SCALED_FONT, scaled_font));
-}
-
 static void
 _emit_surface (cairo_surface_t *surface)
 {