Build-Depend on libhash-storediterator-perl

Fix:

|  Can't locate Hash/StoredIterator.pm in @INC (@INC contains: /tmp/buildd/ngcp-schema-1.002+0~20130704154256.36+wheezy~1.gbp466460/blib/lib /tmp/buildd/ngcp-schema-1.002+0~20130704154256.36+wheezy~1.gbp466460/blib/arch /etc/perl /usr/local/lib/perl/5.14.2 /usr/local/share/perl/5.14.2 /usr/lib/perl5 /usr/share/perl5 /usr/lib/perl/5.14 /usr/share/perl/5.14 /usr/local/lib/site_perl . CODE(0x1858180) CODE(0x1858270)) at /usr/share/perl5/perl5i/2/HASH.pm line 10.
|  Compilation failed in require at /usr/share/perl5/perl5i/2/autobox.pm line 10.
|  Compilation failed in require at /usr/share/perl5/perl5i/2.pm line 13.
|  BEGIN failed--compilation aborted at /usr/share/perl5/perl5i/2.pm line 13.
|  Compilation failed in require at /usr/share/perl5/Module/Runtime.pm line 317.
|  BEGIN failed--compilation aborted at t/compile.t line 1.
|  t/compile.t ..
|  Dubious, test returned 2 (wstat 512, 0x200)
|  No subtests run