kbuild: fix comment in Kbuild.include

Noted by Olaf Hering <olh@suse.de>

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
diff --git a/scripts/Kbuild.include b/scripts/Kbuild.include
index 3e7e0b2..c3d2e4e 100644
--- a/scripts/Kbuild.include
+++ b/scripts/Kbuild.include
@@ -45,7 +45,7 @@
 endef
 
 ######
-# cc support functions to be used (only) in arch/$(ARCH)/Makefile
+# gcc support functions
 # See documentation in Documentation/kbuild/makefiles.txt
 
 # as-option