removed viewall signature from dwm.h

dwm.h

@@ -168,5 +168,4 @@ extern void togglefloat(Arg *arg);		/* toggles focusesd client between floating/
 extern void togglemode(Arg *arg);		/* toggles global arrange function (dotile/dofloat) */
 extern void toggleview(Arg *arg);		/* toggles the tag with arg's index (in)visible */
 extern void view(Arg *arg);			/* views the tag with arg's index */
-extern void viewall(Arg *arg);			/* views all tags, arg is ignored */
 extern void zoom(Arg *arg);			/* zooms the focused client to master area, arg is ignored */