Enable -Wfortify-source

Bug: 315245071
Change-Id: I06ced7e599dea83a6dbd68b89c996a3127c318ae
diff --git a/cc/config/global.go b/cc/config/global.go
index 0e8fff6..707b9dc 100644
--- a/cc/config/global.go
+++ b/cc/config/global.go
@@ -362,8 +362,6 @@
 		"-Wno-array-parameter",
 		"-Wno-gnu-offsetof-extensions",
 		"-Wno-pessimizing-move",
-		// TODO: Enable this warning http://b/315245071
-		"-Wno-fortify-source",
 	}
 
 	llvmNextExtraCommonGlobalCflags = []string{