bug#45390: Shell-script mode doesn’t like redirection at beginning of command

[Dario Gjorgjevski]

The “for” and “echo” in the following example are not font-locked in
shell-script mode, despite being syntactically valid.  (From my
experience, the “>&2 echo ...” idiom is quite common in practice, too.)

    >/dev/null for i in {1..5} ; do
        echo $i
    done
    >&2 echo 'Error!'

Additionally, the “for” and its “done” are not matched so the SMIE
grammar also needs fixing.

Best regards,
Dario

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