Turn off relaxed-template-template-args as a workaround

ToT switched on "relaxed-template-template-args" by default. This does
not work with our outdated libc++. Turn it off until we have the new
libc++.

Test: build with Kokoro ToT Clang (build 2417)
Bug: 341084395
Bug: 332594828
Change-Id: I994c476c1f7b4abd81e5ae0bde4e1f9afd1aa920
diff --git a/cc/config/global.go b/cc/config/global.go
index 16b5e09..290a27d 100644
--- a/cc/config/global.go
+++ b/cc/config/global.go
@@ -136,6 +136,11 @@
 		// displaying logs in web browsers.
 		"-fmessage-length=0",
 
+		// Disable C++17 "relaxed template template argument matching" as a workaround for
+		// our out-dated libcxx.
+		// http://b/341084395
+		"-fno-relaxed-template-template-args",
+
 		// Using simple template names reduces the size of debug builds.
 		"-gsimple-template-names",