re PR libffi/65567 (ERROR: tcl error sourcing /test/gnu/gcc/gcc/libffi/testsuite/libffi.complex/complex.exp)

	PR libffi/65567
	* testsuite/lib/libffi.exp (libffi_feature_test): Use split to ensure
	lindex is applied to a list.

From-SVN: r221765