Restore use of tr1::unordered_map in testsuite

My recent change to this file broke running the testsuite with
-std=c++98 because std::unordered_map isn't available. This fixes it.

	* testsuite/util/testsuite_abi.h: Restore use of tr1/unordered_map
	when compiled as C++98.

From-SVN: r277302

libstdc++-v3/ChangeLog

 2019-10-22  Jonathan Wakely  <jwakely@redhat.com>
 
+	* testsuite/util/testsuite_abi.h: Restore use of tr1/unordered_map
+	when compiled as C++98.
+
 	* include/bits/memoryfwd.h (uses_allocator): Do not declare for C++98.
 	* testsuite/17_intro/names.cc: Check uses_allocator in C++98.
 

libstdc++-v3/testsuite/util/testsuite_abi.h

@@ -22,7 +22,13 @@
 #include <stdexcept>
 #include <vector>
 #include <locale>
-#include <unordered_map>
+#if __cplusplus >= 201103L
+# include <unordered_map>
+namespace unord = std;
+#else
+# include <tr1/unordered_map>
+namespace unord = std::tr1;
+#endif
 #include <cxxabi.h>
 
 // Encapsulates symbol characteristics.
@@ -65,7 +71,7 @@ struct symbol
 };
 
 // Map type between symbol names and full symbol info.
-typedef std::unordered_map<std::string, symbol> 	symbols;
+typedef unord::unordered_map<std::string, symbol> 	symbols;
 
 
 // Check.