alpha: change to new Makefile flag variables

Signed-off-by: matt mooney <mfm@muteddisk.com>
Signed-off-by: Matt Turner <mattst88@gmail.com>
diff --git a/arch/alpha/mm/Makefile b/arch/alpha/mm/Makefile
index 09399c5..c993d3f 100644
--- a/arch/alpha/mm/Makefile
+++ b/arch/alpha/mm/Makefile
@@ -2,7 +2,7 @@
 # Makefile for the linux alpha-specific parts of the memory manager.
 #
 
-EXTRA_CFLAGS := -Werror
+ccflags-y := -Werror
 
 obj-y	:= init.o fault.o extable.o