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/oprofile/Makefile b/arch/alpha/oprofile/Makefile
index 4aa5624..3473de7 100644
--- a/arch/alpha/oprofile/Makefile
+++ b/arch/alpha/oprofile/Makefile
@@ -1,4 +1,4 @@
-EXTRA_CFLAGS := -Werror -Wno-sign-compare
+ccflags-y := -Werror -Wno-sign-compare
 
 obj-$(CONFIG_OPROFILE) += oprofile.o