PKG_OZCD, De-register OZ call substitution

rst $08, defw $200f


IN:	DE=OZ call ID to be deregistered
	BC=package call ID originally used
OUT(success):
	Fc=0
OUT(failure):
	Fc=1
	A=rc_pnf, call substitution table not available
	A=rc_bad, invalid OZ call ID, or not previously substituted

Registers changed after return:
  ..BC..HL/IXIY same
  AF..DE../.... different

Notes:
