dix: clean up including panoramix headers

* use their actual path instead of relying this to be in compiler's
  include path list.
* no need to do it only conditionally, no #ifdef needed

Signed-off-by: Enrico Weigelt, metux IT consult <info@metux.net>

dix/main.c

@@ -99,6 +99,7 @@ Equipment Corporation.
 #include "os/ddx_priv.h"
 #include "os/osdep.h"
 #include "os/screensaver.h"
+#include "Xext/panoramiXsrv.h"
 
 #include "scrnintstr.h"
 #include "misc.h"
@@ -115,10 +116,6 @@ Equipment Corporation.
 #include "extnsionst.h"
 #include "privates.h"
 #include "exevents.h"
-#ifdef XINERAMA
-#include "panoramiXsrv.h"
-#else
-#endif /* XINERAMA */
 
 #ifdef DPMSExtension
 #include <X11/extensions/dpmsconst.h>