Removed a workaround for a bug that is fixed for next release.

https://github.com/D-Programming-Language/phobos/pull/1090#discussion_r2757996
http://d.puremagic.com/issues/show_bug.cgi?id=9385
https://github.com/D-Programming-Language/dmd/commit/f1738a00e9ecb09cbfeff8d07971a5485866e6f9