devil: fix gcc6 build again

srcpkgs/devil/template

@@ -28,11 +28,8 @@ pre_configure() {
 }
 
 post_configure() {
-	local _gccver
-
-	# Disable RESTRICT_KEYWORD for gcc5
-	_gccver=$(gcc --version|awk '/^gcc / { print $3 }')
-	if [ "${_gccver%%.*}" -gt 4 ]; then
+	# Disable RESTRICT_KEYWORD for gcc5 and newer
+	if [ ${XBPS_GCC_VERSION_MAJOR} -gt 4 ]; then
 		sed -i include/IL/config.h \
 			-e's;#define RESTRICT_KEYWORD.*;#undef RESTRICT_KEYWORD;'
 	fi