adapt pam_winbin.c to deal with later iniparser versions

[Noel Power]

I came across another strange pam related issue with the
require_membership_of specified flag in pam_winbind.conf with
opensuse-12.3 ( and possibly earlier versions ) if you have a blank (
e.g. empty ) value like

    require_membership_of specified=

then pam will refuse to authenticate any user

The problem stems from the fact that we use a different ( later )
version of iniparser (3.1.5) where the behaviour of iniparser when
dealing with blank or non-existing key values is different. This patch
works around the problem ( and although strictly not necessary for
upstream currently ) and will future proof the code against the eventual
upgrade of iniparser. Please review

thanks,

Noel
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