configure: Adjust several assembler checks to remove an unused parm.

configure: Adjust several assembler checks to remove an unused parm.

In r12-3048-ge0b6d0b39c6, the GAS version parameter was removed from
the gcc_GAS_CHECK_FEATURE macro.  It seems that overlapping comit/test
cycles resulted in several AMDGCN and one Darwin commit with the now
extra parameter still present.

This causes wrong configure code to be generated when autoreconf is
used in the gcc directory.

Fixed by removing the extraneous parm from the AMDGCN and Darwin cases.

Signed-off-by: Iain Sandoe <iain@sandoe.co.uk>
gcc/ChangeLog:

	* configure.ac (darwin2[[0-9]]* | darwin19*): Alter use of
	gcc_GAS_CHECK_FEATURE to remove an extraneous parameter.
	(amdgcn-* | gcn-*) Likewise.