Merge pull request #4376 from dearblue/leak-symbols

Fix leaked function symbols

src/gc.c

@@ -399,7 +399,7 @@ mrb_gc_init(mrb_state *mrb, mrb_gc *gc)
 
 static void obj_free(mrb_state *mrb, struct RBasic *obj, int end);
 
-void
+static void
 free_heap(mrb_state *mrb, mrb_gc *gc)
 {
   mrb_heap_page *page = gc->heaps;

src/symbol.c

@@ -91,7 +91,7 @@ sym_inline_unpack(mrb_sym sym, char *buf, mrb_int *lenp)
 }
 #endif
 
-uint8_t
+static uint8_t
 symhash(const char *key, size_t len)
 {
     uint32_t hash, i;