restore once removed mrb_garbage_collect()

include/mruby.h

@@ -272,6 +272,7 @@ mrb_value mrb_Float(mrb_state *mrb, mrb_value val);
 mrb_value mrb_inspect(mrb_state *mrb, mrb_value obj);
 mrb_bool mrb_eql(mrb_state *mrb, mrb_value obj1, mrb_value obj2);
 
+void mrb_garbage_collect(mrb_state*);
 void mrb_full_gc(mrb_state*);
 void mrb_incremental_gc(mrb_state *);
 int mrb_gc_arena_save(mrb_state*);

src/gc.c

@@ -1018,6 +1018,12 @@ mrb_full_gc(mrb_state *mrb)
   GC_TIME_STOP_AND_REPORT;
 }
 
+void
+mrb_garbage_collect(mrb_state *mrb)
+{
+  mrb_full_gc(mrb);
+}
+
 int
 mrb_gc_arena_save(mrb_state *mrb)
 {