[Ping][Patch, testsuite]: Don't xfail sibcalls on AVR

[Georg-Johann Lay]

Target avr now supports tail calls, so don't xfail on that.

testsuite/

2011-03-29  Georg-Johann Lay  <avr@gjlay.de>

	* gcc.dg/sibcall-3.c: Don't xfail on AVR.
	* gcc.dg/sibcall-4.c: Don't xfail on AVR.

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