[RP] Caps_Lock is not a modifier

[Rupert Levene]

If you do "escape Caps_Lock" then rp doesn't recognize the sequence
"Caps_Lock Caps_Lock". This is because the IsModifierKey function thinks
Caps_Lock is a modifier. (Incidentally, my xmodmap setup is such that caps lock
_doesn't_ toggle the shift lock, and it fails if this isn't the case
as well).

Ugly-as-hell fix: adjust read_key in input.c as follows:

--- ../../../ratpoison-split/ratpoison/src/input.c      Wed Oct 16 14:22:11 2002
+++ input.c     Sun Nov 10 18:47:59 2002
@@ -262,13 +262,15 @@
 {
   XEvent ev;
   int nbytes;
-
+  KeySym capslock = XStringToKeysym("Caps_Lock");
+  
   do
     {
       XMaskEvent (dpy, KeyPressMask, &ev);
       *modifiers = ev.xkey.state;
       nbytes = cook_keycode (&ev.xkey, keysym, modifiers, keysym_name, len, 0);
-    } while (IsModifierKey (*keysym));
+      PRINT_DEBUG("Got %s\n",  XKeysymToString(*keysym));
+    } while (IsModifierKey (*keysym) && *keysym != capslock);
 
   return nbytes;
 }