Add -std user flags to cc test to ensure order

Test: go test soong tests
Change-Id: Iff2b82f59e138089d1c1726d9b51e040b00340ba
diff --git a/cc/cc_test.go b/cc/cc_test.go
index bcc6fcd..31d91b6 100644
--- a/cc/cc_test.go
+++ b/cc/cc_test.go
@@ -3980,9 +3980,9 @@
 	conly := []string{"-fPIC", "${config.CommonGlobalConlyflags}"}
 	cppOnly := []string{"-fPIC", "${config.CommonGlobalCppflags}", "${config.DeviceGlobalCppflags}", "${config.ArmCppflags}"}
 
-	cflags := []string{"-Wall", "-Werror"}
-	cstd := []string{"-std=gnu99"}
-	cppstd := []string{"-std=gnu++17", "-fno-rtti"}
+	cflags := []string{"-Wall", "-Werror", "-std=candcpp"}
+	cstd := []string{"-std=gnu99", "-std=conly"}
+	cppstd := []string{"-std=gnu++17", "-std=cpp", "-fno-rtti"}
 
 	lastIncludes := []string{
 		"out/soong/ndk/sysroot/usr/include",
@@ -4025,6 +4025,9 @@
 		cc_library {
 			name: "libfoo",
 			srcs: ["%s"],
+			cflags: ["-std=candcpp"],
+			conlyflags: ["-std=conly"],
+			cppflags: ["-std=cpp"],
 			local_include_dirs: ["local_include_dirs"],
 			export_include_dirs: ["export_include_dirs"],
 			export_system_include_dirs: ["export_system_include_dirs"],