OpenBSD support for libpciaccess.

xserver and libpciaccess both need to open /dev/xf86, which can only
be opened once.  I implemented pci_system_init_dev_mem() like Ian
suggested.  This requires some minor changes to the BSD-specific
os-support code.  Since pci_system_init_dev_mem() is a no-op on
FreeBSD this should be no problem.

hw/xfree86/os-support/bsd/i386_video.c

@@ -212,6 +212,9 @@ xf86OSInitVidMem(VidMemInfoPtr pVidMem)
 	pVidMem->mapMem = mapVidMem;
 	pVidMem->unmapMem = unmapVidMem;
 
+	if (useDevMem)
+		pci_system_init_dev_mem(devMemFd);
+
 #ifdef HAS_MTRR_SUPPORT
 	if (useDevMem) {
 		if (cleanMTRR()) {

hw/xfree86/os-support/bus/bsd_pci.c

@@ -81,4 +81,6 @@ bsdPciInit(void)
 {
     pciNumBuses = 1;
     pciBusInfo[0] = &bsd_pci;
+
+    xf86InitVidMem();
 }

hw/xfree86/utils/ioport/Makefile.am

@@ -37,7 +37,7 @@ ioport_CFLAGS = $(DIX_CFLAGS) $(XORG_CFLAGS)
 ioport_LDADD = \
 	../../os-support/libxorgos.la \
 	../../dummylib/libdummy-nonserver.a \
-	${UTILS_SYS_LIBS}
+	${UTILS_SYS_LIBS} ${PCIACCESS_LIBS}
 
 
 ioport_SOURCES =	\