PKG_DRG, Deregister a package

rst $08, defw $0c0f


IN:	A=package ID
OUT(success):
	Fc=0
OUT(failure):
	Fc=1
	A=rc_use, resources in use
	A=rc_pnf, couldn't access package

Registers changed after return:
  ..BCDEHL/IXIY same
  AF....../.... different


Notes:
	For use by Installer only
