[patch] Use @SHELL@ in maxima.in



The maxima script doesn't work on cygwin, as /bin/sh doesn't support
getopts.  The fix is to use /bin/bash.  The following works for me
on cygwin and irix.  

OK to apply?

Index: maxima.in
===================================================================
RCS file: /cvsroot/maxima/maxima/src/maxima.in,v
retrieving revision 1.6
diff -u -r1.6 maxima.in
--- maxima.in   28 Apr 2002 21:21:59 -0000      1.6
+++ maxima.in   23 Jun 2002 12:27:50 -0000
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!@SHELL@

 usage () {
        cat << EOF