backport: target-supports.exp (check_effective_target_ucn_nocache): New function.

backport: target-supports.exp (check_effective_target_ucn_nocache): New function.

	Backport from mainline:
	2010-03-01  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>

	* lib/target-supports.exp (check_effective_target_ucn_nocache):
	New function.
	(check_effective_target_ucn): Likewise.

	* g++.dg/other/ucnid-1.C: Don't XFAIL on *-*-solaris2.*, but skip
	if !ucn.
	* gcc.dg/ucnid-2.c: Likewise.
	* gcc.dg/ucnid-3.c: Likewise.
	* gcc.dg/ucnid-4.c: Likewise.
	* gcc.dg/ucnid-11.c: Likewise.
	* gcc.dg/ucnid-12.c: Likewise.
	* gcc.dg/ucnid-6.c: Skip if !ucn.
	* gcc.dg/ucnid-9.c: Likewise.

From-SVN: r161104