Fix leaked function symbols

- `free_heap()` in src/gc.c
- `symhash()` in src/symbol.c
- `no_optimize()` in mrbgems/mruby-compiler/core/codegen.c

1 files changed, 1 insertions, 1 deletions

diff --git a/src/gc.c b/src/gc.c
index ec52787e8..d07335eca 100644
--- a/src/gc.c
+++ b/src/gc.c
@@ -396,7 +396,7 @@ 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;