Ticket #543 - Sorting with attributes in ldapsearch gives incorrect result
    
    Bug description: In the server side sorting compare function
    compare_entries_sv, if multiple attribute types are specified,
    the sort spec for each attribute is scanned one by one in the
    for loop.  In the for loop, instead of using the "current"
    spec, the first spec is kept using.  If the attribute types
    have different syntaxes (e.g., cis, tel), then the first
    syntax is unexpectedly selected for the second syntax.
    
    Fix description: This patch correctly uses the current spec
    in the for loop.
    
    Reviewed by Nathan (Thank you!!)
    (cherry picked from commit 95f425da43b380163c2ddae66fc77d2b863a00e5)