Stop including <X11/Xalloca.h> in parseutils.c

I can not find any point in our git history at which alloca() or the
Xalloca.h macros ALLOCATE_LOCAL() & DEALLOCATE_LOCAL() were actually
used in this source file.
Signed-off-by: Alan Coopersmith <alan.coopersmith@oracle.com>

parseutils.c

@@ -29,7 +29,6 @@
 #include "xkbpath.h"
 #include <X11/keysym.h>
 #include <X11/extensions/XKBgeom.h>
-#include <X11/Xalloca.h>
 #include <limits.h>
 #include <stdlib.h>