Replace BSD custom PCI code with a stub implementation thanks to pciaccess.

Note that pciaccess doesn't yet have Net/OpenBSD support, but the relevant
code should go there instead of disconnected code in the X Server.

While here, remove the now-disabled INCLUDE_XF86_NO_DOMAIN from the headers,
and un-disable xf8StdAccResFromOS for those OSes without domain support which
will need it.

hw/xfree86/os-support/shared/stdResource.c

@@ -43,14 +43,13 @@
 /* Avoid Imakefile changes */
 #include "bus/Pci.h"
 
-#ifdef USESTDRES
+#if defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__) || \
+	defined(__DragonFly__)
 #define xf86StdAccResFromOS xf86AccResFromOS
 
 _X_EXPORT resRange PciAvoid[] = {_PCI_AVOID_PC_STYLE, _END};
 #endif
 
-#ifdef INCLUDE_XF86_NO_DOMAIN
-
 resPtr
 xf86StdAccResFromOS(resPtr ret)
 {
@@ -117,5 +116,3 @@ xf86StdAccResFromOS(resPtr ret)
     /* XXX add others */
     return ret;
 }
-
-#endif /* INCLUDE_XF86_NO_DOMAIN */