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/math-emu/Makefile b/arch/alpha/math-emu/Makefile
index 359ef08..7f46719 100644
--- a/arch/alpha/math-emu/Makefile
+++ b/arch/alpha/math-emu/Makefile
@@ -2,7 +2,7 @@
 # Makefile for the FPU instruction emulation.
 #
 
-EXTRA_CFLAGS := -w
+ccflags-y := -w
 
 obj-$(CONFIG_MATHEMU) += math-emu.o