Prepare to build clang-r468909

* Allow/show clang deprecated* and array-parameter warnings
  to pass build.py with r468909.

Test: presubmit
Bug: 241941550
Bug: 241601211
Change-Id: I46bc1138861371ece24e88fad2d64fdf38ca605d

cc/config/global.go

@@ -290,7 +290,12 @@ var (
 		"-Wno-deprecated-non-prototype",
 	}
 
-	llvmNextExtraCommonGlobalCflags = []string{}
+	llvmNextExtraCommonGlobalCflags = []string{
+		// New warnings to be fixed after clang-r468909
+		"-Wno-error=array-parameter",     // http://b/241941550
+		"-Wno-error=deprecated-builtins", // http://b/241601211
+		"-Wno-error=deprecated",          // in external/googletest/googletest
+	}
 
 	IllegalFlags = []string{
 		"-w",