selinux: change to new flag variable

Replace EXTRA_CFLAGS with ccflags-y.

Signed-off-by: matt mooney <mfm@muteddisk.com>
Signed-off-by: James Morris <jmorris@namei.org>
diff --git a/security/selinux/Makefile b/security/selinux/Makefile
index a30f218..ad5cd76 100644
--- a/security/selinux/Makefile
+++ b/security/selinux/Makefile
@@ -13,7 +13,7 @@
 
 selinux-$(CONFIG_NETLABEL) += netlabel.o
 
-EXTRA_CFLAGS += -Isecurity/selinux -Isecurity/selinux/include
+ccflags-y := -Isecurity/selinux -Isecurity/selinux/include
 
 $(addprefix $(obj)/,$(selinux-y)): $(obj)/flask.h