Revert "Enable -Wfortify-source"

This reverts commit 5735ef6777f11e9057dee1552315a72780817488.

Reason for revert: DroidMonitor: Potential culprit for b/343287447 - verifying through ABTD before revert submission. This is part of the standard investigation process, and does not mean your CL will be reverted.

Change-Id: I1aeeddc251db760e2ab01c734733d351514ec5b0
diff --git a/cc/config/global.go b/cc/config/global.go
index b7ee768..290a27d 100644
--- a/cc/config/global.go
+++ b/cc/config/global.go
@@ -370,6 +370,8 @@
 		"-Wno-unqualified-std-cast-call",
 		"-Wno-array-parameter",
 		"-Wno-gnu-offsetof-extensions",
+		// TODO: Enable this warning http://b/315245071
+		"-Wno-fortify-source",
 	}
 
 	llvmNextExtraCommonGlobalCflags = []string{