Another workaround removed

Author: JohanMabille

include/xtensor/core/xvectorize.hpp

@@ -54,14 +54,9 @@ namespace xt
     template <class F, class R, class... Args>
     xvectorizer<F, R> vectorize(F&& f, R (*)(Args...));
 
-// Workaround for Visual Studio 15.7.1.
-// Error C2668 (ambiguous call to overloaded function) mistaking a declarations
-// for the definition of another overload.
-#ifndef _MSC_VER
     template <class F>
     auto vectorize(F&& f)
         -> decltype(vectorize(std::forward<F>(f), std::declval<detail::get_function_type<F>*>()));
-#endif
 
     /******************************
      * xvectorizer implementation *