#5 mston setup did not setup correctly on SunOS 5.10 platform

[tomohiro yamashita]

solaris's sh shell can't understand folloing command syntax.

# Get the default version of mailclient
setup_mailclient() {
[ -n "$OUROS" ] || run_nsarch $1
(cd bin; ln -s ../build/$OUROS/{mailclient,getdist} ./ )
}

So, I have to chane form #!/bin/sh to #!/bin/bash.