Make check_effective_target_c++ work for libstdc++

	* lib/target-supports.exp (check_effective_target_c): Fix indentation.
	(check_effective_target_c++): Likewise. Also match for libstdc++.

From-SVN: r238916

gcc/testsuite/ChangeLog

+2016-07-31  Jonathan Wakely  <jwakely@redhat.com>
+
+	* lib/target-supports.exp (check_effective_target_c): Fix indentation.
+	(check_effective_target_c++): Likewise. Also match for libstdc++.
+
 2016-07-30  Steven G. Kargl <kargl@gcc.gnu.org>
 
 	PR fortran/41922

gcc/testsuite/lib/target-supports.exp

@@ -7012,7 +7012,7 @@ proc check_effective_target_c { } {
 
 proc check_effective_target_c++ { } {
     global tool
-    if [string match $tool "g++"] {
+    if { [string match $tool "g++"] || [string match $tool "libstdc++"] } {
 	return 1
     }
  return 0