[PATCH] Add apr_uid_shell_get

[Andrew Stribblehill <a....@durham.ac.uk>]

I'm trying to improve httpd's mod_userdir so that it knows it
shouldn't serve ~fool when user 'fool' has an administratively
prohibited shell, so:

UserDir DisableShell /bin/badlad

To this end, I need a function to query the user's shell. It seems
sensible to me (though I am new to apr) that it should go into apr.

I've written a patch that does this; it's attached.

What do you think?

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