Eliminate function that does not compile with MSVC 14.33.31629, perhaps because of a compiler bug.  It compiles with older MSVC versions, gcc-8, and gcc-11

Author: Tim Crews

include/flags/flags.hpp

@@ -84,14 +84,6 @@ template <class E> class flags {
   flags(enum_type e, Args ... args) noexcept : flags{e, args...} {}
 
 
-  template <class FwIter>
-  flags(FwIter b, FwIter e,
-        typename convertible<decltype(*b)>::type = nullptr)
-  noexcept(noexcept(std::declval<flags>().insert(std::declval<FwIter>(),
-                                                 std::declval<FwIter>())))
-  : val_(0)
-  { insert(b, e); }
-
 
   constexpr explicit operator bool() const noexcept { return val_ != 0; }