perl-X500-DN: don't set $Parse::RecDescent::skip to 'undef'

This update fixes the following issue with perl-X500-DN:
- bnc#799660: don't set $Parse::RecDescent::skip to 'undef' (e.g. this makes yast2-ldap-server configurable again)

Fixed bugs
bnc#799660
yast2 ldap-server - uninitialized value $initial_skip ... /usr/lib/perl5/vendor_perl/5.16.2/Parse/RecDescent.pm line 3054
Selected Binaries
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