* dev.scm (cload): Change #:arch argument to take the path to the

	* dev.scm (cload): Change #:arch argument to take the path to the
	.cpu file instead of just the name of the architecture.
	* read.scm (arch-path): Remove trailing '/'.
	(cpu-load): Set `arch-path' to directory of .cpu file.
	(-cgen): Don't set `arch-path' here.
	(include): Update.
	* doc/porting.texi: Update.