* gdk/gdkcursor.h: Directly include the contents
of gdkcursors.h in the GdkCursorType enum.
* gdk/gdkcursors.h: Deleted.
* gdk/gdkkeysyms.h: Remove XFree86-specific keysyms, add
header boilerplate.
* gdk/Makefile.am: Remove the X-derived-headers rule.
* gdk/tmpl/cursors.sgml: Document GdkCursor and standard cursors.