libstdc++: Simplify nullary _Flat_set_impl::_M_try_emplace overload

Remove the unused template parameter pack _Args (which always gets
deduced to an empty pack).

libstdc++-v3/ChangeLog:

	* include/std/flat_set (_Flat_set_impl::_M_try_emplace):
	Turn nullary overload into a non-template.

Reviewed-by: Jonathan Wakely <jwakely@redhat.com>
1 file changed