Re: dependency list for static libraries

This feature doesn't actually require plugin support, that was a
mistake in the previous patch.  Fixes these fails:

hppa-hp-hpux10  +FAIL: ar adding library dependencies
i386-bsd  +FAIL: ar adding library dependencies
i386-msdos  +FAIL: ar adding library dependencies
ns32k-netbsd  +FAIL: ar adding library dependencies
ns32k-pc532-mach  +FAIL: ar adding library dependencies
pdp11-dec-aout  +FAIL: ar adding library dependencies

	* ar.c (main): Use plugin_target rather than "target" when
	resetting libdeps_bfd target.