Include -fno-omit-frame-pointer when usinag ASan and UBSan

this is recommended to reliably display the call stack when using the
print_stacktrace option.

src/build/Common.gmake

@@ -161,7 +161,7 @@ ifdef DEBUG
   CFLAGS += -D_FORTIFY_SOURCE=3 -O1
  endif
  ifdef SANITIZE
-  CFLAGS += -fsanitize=undefined,address
+  CFLAGS += -fsanitize=undefined,address -fno-omit-frame-pointer
   LDFLAGS += -fsanitize=undefined,address
  endif
 else