Add a Debian patch to finish fixing the build with SIP 4.19.6.

The upstream patch from r457852 is necessary but not enough.

PR: 224739
Obtained from: https://anonscm.debian.org/cgit/pkg-kde/kde-sc/pykde4.git/commit/debian/patches?id=9de587a159f47d30068c84127c06917594eaf2e0