Fix includes right throughout the Xserver tree:

change "foo.h" to <X11/foo.h> for core headers, e.g. X.h, Xpoll.h;
change "foo.h", "extensions/foo.h" and "X11/foo.h" to
    <X11/extensions/foo.h> for extension headers, e.g. Xv.h;
change "foo.[ch]" to <X11/Xtrans/foo.[ch]> for Xtrans files.

ilbm/ilbmbitblt.c

@@ -52,8 +52,8 @@ SOFTWARE.
 /* Modified jun 95 by Geert Uytterhoeven (Geert.Uytterhoeven@cs.kuleuven.ac.be)
    to use interleaved bitplanes instead of normal bitplanes */
 
-#include "X.h"
-#include "Xprotostr.h"
+#include <X11/X.h>
+#include <X11/Xprotostr.h>
 
 #include "miscstruct.h"
 #include "regionstr.h"