switch back to using USE_I386_IOPL for amd64 since it gets us x86_64_iopl

if __x86_64__ is defined. this should fix libxorgos.a build on amd64.

USE_AMD64_IOPL is for openbsd if the configure.ac is to be believed.

XXX we may also want to enable PCCONS_SUPPORT and HAS_APERTURE_DRV for
    amd64 as well?

external/mit/xorg/server/xorg-server/hw/xfree86/xorgos/Makefile

@@ -1,4 +1,4 @@
-#	$NetBSD: Makefile,v 1.6 2008/09/12 07:47:39 mrg Exp $
+#	$NetBSD: Makefile,v 1.7 2008/09/18 10:57:03 rtr Exp $
 
 .include "../../../Makefile.serverlib"
 .include "../../../Makefile.servermod"
@@ -24,12 +24,9 @@ SRCS.bsd+=	bsd_apm.c
 SRCS.bsd+=	i386_video.c stdResource.c lnx_agp.c
 .for _FN in ${SRCS.bsd}
 .if ${MACHINE} == "i386"
-CPPFLAGS.${_FN}+=	-DPCCONS_SUPPORT -DHAS_APERTURE_DRV \
-			-DUSE_I386_IOPL
-.else
-CPPFLAGS.${_FN}+=	-DUSE_AMD64_IOPL
+CPPFLAGS.${_FN}+=	-DPCCONS_SUPPORT -DHAS_APERTURE_DRV
 .endif
-CPPFLAGS.${_FN}+=	-DPCVT_SUPPORT -DWSCONS_SUPPORT \
+CPPFLAGS.${_FN}+=	-DUSE_I386_IOPL -DPCVT_SUPPORT -DWSCONS_SUPPORT \
 			-DUSESTDRES -DHAVE_SYSV_IPC \
 			-DHAS_MTRR_BUILTIN
 .endfor