Glen: Minor tweaks to locale.cpp to help it compile with exceptions turned off.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@187332 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/src/locale.cpp b/src/locale.cpp
index bf95732..6300ce1 100644
--- a/src/locale.cpp
+++ b/src/locale.cpp
@@ -18,9 +18,10 @@
 #include "codecvt"
 #include "vector"
 #include "algorithm"
-#include "algorithm"
 #include "typeinfo"
-#include "type_traits"
+#ifndef _LIBCPP_NO_EXCEPTIONS
+#  include "type_traits"
+#endif
 #include "clocale"
 #include "cstring"
 #include "cwctype"