* configure.in (gcc_cv_as): Use $target_alias in directory searchs
	rather than $target.  Heed program_prefix and
	program_transform_name.  Search for gas in cross-compiler case too.
	"test -x" rather than "test -f".
	(gcc_cv_ld): Likewise.
	(gcc_cv_nm): Heed program_prefix and program_transform_name.
	(gcc_cv_objdump): Likewise.
	* configure: Regenerate.

From-SVN: r51489