Re: [bug #68587] Prefer runuser over su

Sorry, I'm not able to log in to Savannah today; the login page gives
HTTP 502 errors.

Go ahead and apply the patch, thanks.   I think runuser is a big
improvement here.

However, the `which` command is not in POSIX.   The POSIX alternative
is `command -v` I think.   However, perhaps we can just run it to find
out if it is usable:

runuser  -s /bin/sh -c true "$LOCALUSER"

I also note that the code we are changing here had some variables that
should have been better quoted.

James.