Fix PR c++/69098 (bogus errors with static data member template)

Fix PR c++/69098 (bogus errors with static data member template)

gcc/cp/ChangeLog:

	PR c++/69098
	* pt.c (lookup_and_finish_template_variable): New function,
	extracted from ...
	(tsubst_copy_and_build) [TEMPLATE_ID_EXPR]: ... here.
	(tsubst_qualified_id): Consider that EXPR might be a variable
	template.
	* typeck.c (check_template_keyword): Don't emit an error
	if DECL is a variable template.

gcc/testsuite/ChangeLog:

	PR c++/69098
	* g++.dg/cpp1y/69098.C: New test.
	* g++.dg/cpp1y/69098-2.C: New test.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@233365 138bc75d-0d04-0410-961f-82ee72b054a4