Add gcc 4.0.0 support. Note... I haven't needed the sjlj exception support in some time, but haven't touched the default in this commit.

toolchain/gcc/Config.in

@@ -35,6 +35,9 @@ choice
 	config BR2_GCC_VERSION_3_4_3
 		bool "gcc 3.4.3"
 
+	config BR2_GCC_VERSION_4_0_0
+		bool "gcc 4.0.0"
+
 	config BR2_GCC_VERSION_4_1_0
 		bool "gcc 4.1.0"
 
@@ -50,6 +53,7 @@ config BR2_GCC_VERSION
 	default "3.4.1"     if BR2_GCC_VERSION_3_4_1
 	default "3.4.2"     if BR2_GCC_VERSION_3_4_2
 	default "3.4.3"     if BR2_GCC_VERSION_3_4_3
+	default "4.0.0"     if BR2_GCC_VERSION_4_0_0
 	default "4.1.0"     if BR2_GCC_VERSION_4_1_0