compilation fixes for 2.065

- overload of findNextUDA is ambiguous

- __traits getFunctionAttributes isn't available
Sorry I just realized this while re-reading your P.R., but this won't work for `@property` functions, you need std.traits.FunctionTypeOf here.
See: http://dpaste.dzfl.pl/57fd329c3fce
Also, for the record, using FunctionTypeOf *could* segv the compiler, but this is internal module, and it's only called from `vibe.web.rest` so far, but could you add a comment to the function refering to https://issues.dlang.org/show_bug.cgi?id=13874 for future developpers ?