C++17: switch the default.

Bug: http://b/111067277
Change-Id: I07af7cd9e65a6e238d7d256c65927fe128a0f052
Test: builds

parent 7a782203

cc/config/global.go

+1 −1

Original line number	Diff line number	Diff line
		@@ -114,7 +114,7 @@ var (
		}

		CStdVersion = "gnu99"
		CppStdVersion = "gnu++14"
		CppStdVersion = "gnu++17"
		ExperimentalCStdVersion = "gnu11"
		ExperimentalCppStdVersion = "gnu++2a"