make binutils 2.18 default for ppc44x and ppc40x

SVN-Revision: 14358

toolchain/binutils/Config.in

@@ -33,4 +33,5 @@ config BINUTILS_VERSION
 	default "2.18"            if BINUTILS_VERSION_2_18
 	default "2.19"            if BINUTILS_VERSION_2_19
 	default "2.18"            if TARGET_avr32
+	default "2.18"            if TARGET_ppc44x || TARGET_ppc40x
 	default "2.17"