change default gcc version to 3.4.5

toolchain/gcc/Config.in

@@ -4,7 +4,7 @@ comment "Gcc Options"
 
 choice
 	prompt "GCC compiler Version"
-	default BR2_GCC_VERSION_3_4_2
+	default BR2_GCC_VERSION_3_4_5
 	help
 	  Select the version of gcc you wish to use.