pcp update: pmwebd diagnostics tweak

["Frank Ch. Eigler" <fche@xxxxxxxxxx>]

Hi -

On pcpfans.git fche/pmwebd:

commit 69cf9b18175c4e6abc3b51ea36672687af1b0770
Author: Frank Ch. Eigler <fche@xxxxxxxxxx>
Date:   Thu Apr 21 16:29:23 2016 -0400

    pmwebd: provide better diagnostics for resource fetch failures
    
    The cursed_path_p() function tests files named in incoming URLs for
    validity (existence, reachability, etc.).  Instead of reporting a
    blanket true/false boolean, it now reports a numeric rc.  That number
    is in turn decoded in pmwebres_respond(), to make it easier to
    identify pcp installation problems such as related to SGI PR1143.  No
    QA impact, as only diagnostic log contents are affected.