Prefer the AMD Catalyst "fglrx" driver if found.

--- hw/xfree86/common/xf86pciBus.c.orig	2013-02-07 19:59:55.690518107 +0100
+++ hw/xfree86/common/xf86pciBus.c	2013-02-07 20:01:14.832594170 +0100
@@ -1132,8 +1132,13 @@ xf86VideoPtrToDriverList(struct pci_devi
         driverList[0] = "ast";
         break;
     case 0x1002:
-        driverList[0] = "ati";
+	{
+		int idx = 0;
+
+		driverList[idx++] = "fglrx";
+        	driverList[idx++] = "ati";
         break;
+	}
     case 0x102c:
         driverList[0] = "chips";
         break;