Rename uses of _ and __ because these are getting stepped on by macros from other system code.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@167038 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/include/ios b/include/ios
index 7e489e3..1474deb 100644
--- a/include/ios
+++ b/include/ios
@@ -384,7 +384,7 @@
 
 #ifdef _LIBCPP_HAS_NO_STRONG_ENUMS
 template <>
-struct _LIBCPP_VISIBLE is_error_code_enum<io_errc::_> : public true_type { };
+struct _LIBCPP_VISIBLE is_error_code_enum<io_errc::__lx> : public true_type { };
 #endif
 
 _LIBCPP_VISIBLE