update to submodule.

diff --git a/gcc.git b/gcc.git
index 4c78527..18923f9 160000 (submodule)
--- a/gcc.git
+++ b/gcc.git
@@ -1 +1 @@
-Subproject commit 4c785270a687adce463cf0a724df1dc83ac8bb76
+Subproject commit 18923f95f3b1a60301f47939dd286898d7ae32b0