Make 2000/jarijyrki compile without -I option

The includes for the X11 header files omitted the X11 and this means
running make will fail even if one has the files in a place that's in
the include path (default or via -I option).

Of course if one has X11 include files in a non-standard location (or
where the compiler doesn't look) they'll still have to use the -I
option.

2000/jarijyrki/README.md

@@ -22,6 +22,11 @@ make
 
 You will need X11 header files and libraries installed to build this program.
 
+[Cody Boone Ferguson](/winners.html#Cody_Boone_Ferguson) made it easier to
+compile this by adding `X11/` to the includes of `Xlib.h` and `keysym.h`. Thank
+you Cody!
+
+
 ### To run:
 
 ```sh