Revert "Enable -Wfortify-source"

This reverts commit a6e022c83550ae221b5697228139c7400f83e45c.

Reason for revert: To verify the broken build b/339553761

Change-Id: Ib5546879effc283464a9ef66a20378960f9a56bf
diff --git a/cc/config/global.go b/cc/config/global.go
index 12c1bb9..16b5e09 100644
--- a/cc/config/global.go
+++ b/cc/config/global.go
@@ -365,6 +365,8 @@
 		"-Wno-unqualified-std-cast-call",
 		"-Wno-array-parameter",
 		"-Wno-gnu-offsetof-extensions",
+		// TODO: Enable this warning http://b/315245071
+		"-Wno-fortify-source",
 	}
 
 	llvmNextExtraCommonGlobalCflags = []string{