c++: template keyword accepted before destructor names [PR94336]

c++: template keyword accepted before destructor names [PR94336]

This came up on the C++ core list recently.  We don't diagnose the case
when 'template' is followed by a destructor name which is not permitted
by [temp.names]/5.

	PR c++/94336 - template keyword accepted before destructor names.
	* parser.c (cp_parser_unqualified_id): Give an error when 'template'
	is followed by a destructor name.

	* g++.dg/template/template-keyword2.C: New test.