Depend on libstrictures-perl

Required for auto tests:

| 15:21:38    dh_auto_test
| 15:21:38 Can't locate strictures.pm in @INC (@INC contains: /tmp/buildd/ngcp-schema-1.002+0~20130617131622.3+wheezy~1.gbpb972b3/blib/lib /tmp/buildd/ngcp-schema-1.002+0~20130617131622.3+wheezy~1.gbpb972b3/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 .) at /usr/share/perl5/Module/Runtime.pm line 317.
| 15:21:38 BEGIN failed--compilation aborted at t/compile.t line 1.

debian/control

@@ -22,6 +22,7 @@ Build-Depends: debhelper (>= 8),
                libregexp-common-time-perl,
                libregexp-ipv6-perl,
                libsipwise-base-perl (>= 1.002),
+               libstrictures-perl,
                libtemplate-plugin-xml-perl,
                libtest-xml-simple-perl,
                libthrowable-perl,