i386/testsuite: Fix gcc.target/i386/pr118067*.c tests

These tests use int128 type, so require target int128 instead of ! ia32.
Also, use -mtune= instead of deprecated -mcpu= to avoid compiler warning.

	PR rtl-optimization/118067

gcc/testsuite/ChangeLog:

	* gcc.target/i386/pr118067.c (dg-compile): Use target int128.
	* gcc.target/i386/pr118067-2.c (dg-compile): Ditto.
	(dg-options): Use -mtune= instead of deprecated -mcpu= option.