X*.h headers weren't cleaned up after renaming and merging. (#112)

* Check.h, Stipple.h, XCursors.h, XWaitCur.h, Xcursdef.h,
  Xdefcur.h, and Xicon.h were combined into xbitmaps.h.
* Xdisplay.h is not used and the contents are in MyWindow.h, which
  is used.
* XVersion.h and Xdeflt.h became xdefs.h. Remove 2 stragglers
  that were still including XVersion.h.

src/ldeboot.c

@@ -37,7 +37,6 @@
 #ifdef XWINDOW
 #include <X11/Xlib.h>
 #include <X11/Xutil.h>
-#include "XVersion.h"
 #define LDEX "ldex"
 #endif /* XWINDOW */