Align flags with make

This pulls a number of cflag changes from make since our last sync.

Change-Id: I8c77fc215ed7677b8ac15a6d39143b519068dd55
diff --git a/cc/arm_device.go b/cc/arm_device.go
index d44787d..7212c4f 100644
--- a/cc/arm_device.go
+++ b/cc/arm_device.go
@@ -33,7 +33,7 @@
 		"-ffunction-sections",
 		"-fdata-sections",
 		"-funwind-tables",
-		"-fstack-protector",
+		"-fstack-protector-strong",
 		"-Wa,--noexecstack",
 		"-Werror=format-security",
 		"-D_FORTIFY_SOURCE=2",