Revert "Enable -Wfortify-source"

This reverts commit 4412723f630dbdee83fcef5284781c31fdc4e4a5.

Reason for revert: Droidmonitor triggered revert due to build breakage in b/341339765. 

Change-Id: Id2880f6c0e38504f1adace5e4dab3fd7f6b9b792
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{