Forgot a comma

(cherry picked from commit 193c45aa2f555b56f548f70e7fa0d74a1ce4e412)

src/Makefile.cfg

@@ -58,7 +58,7 @@ ifeq   (,$(filter GCC%,$(.VARIABLES)))
   # If this version is not in the list, default to the latest supported
   ifeq (,$(filter $(v),$(SUPPORTED_GCC_VERSIONS)))
    $(info\
-		Your compiler version, GCC $(version) is not supported by the Makefile.\
+		Your compiler version, GCC $(version), is not supported by the Makefile.\
 		The Makefile will assume GCC $(LATEST_GCC_VERSION).)
    GCC$(subst .,,$(LATEST_GCC_VERSION))=1
   else