pci: add support for pci is boot vga call.

This allows us to ask the kernel for the boot VGA device
instead of nasty guessing.

configure.ac

@@ -1387,6 +1387,7 @@ if test "x$XORG" = xyes; then
 	LIBS=$PCIACCESS_LIBS
 	AC_CHECK_FUNCS([pci_system_init_dev_mem])
 	AC_CHECK_FUNCS([pci_device_enable])
+	AC_CHECK_FUNCS([pci_device_is_boot_vga])
 	LIBS=$SAVE_LIBS
 	CFLAGS=$SAVE_CFLAGS
 	XORG_SYS_LIBS="$XORG_SYS_LIBS $PCIACCESS_LIBS $DLOPEN_LIBS $GLX_SYS_LIBS"

hw/xfree86/common/xf86pciBus.c

@@ -371,6 +371,12 @@ xf86PciProbe(void)
 	    xf86PciVideoInfo[num - 1] = info;
 
 	    pci_device_probe(info);
+#ifdef HAVE_PCI_DEVICE_IS_BOOT_VGA
+	    if (pci_device_is_boot_vga(info)) {
+                primaryBus.type = BUS_PCI;
+                primaryBus.id.pci = info;
+            }
+#endif
 	    info->user_data = 0;
 	}
     }

include/xorg-config.h.in

@@ -118,6 +118,9 @@
 /* Have pci_system_init_dev_mem() */
 #undef HAVE_PCI_SYSTEM_INIT_DEV_MEM
 
+/* Define to 1 if you have the `pci_device_is_boot_vga' function. */
+#undef HAVE_PCI_DEVICE_IS_BOOT_VGA
+
 /* Have pci_enable_device */
 #undef HAVE_PCI_DEVICE_ENABLE