compiler warnings seem to be crashing my package build

[Shawn Sörbom <shawn@sorbom.com>]

Hi,
I have been trying to build kcm-systemd against the KF5 libraries available in 
Sid, but when I do the build using dpkg-buildpackage, I get a compiler warning 
about an un-initialized variable and a subsequent crash. Yet, when I build it 
manually, no such problem occurs. I suspect that dh_autoconfigure sets flags 
to fail on warnings. How do I disable this without a complete override? 
The branch in question is here:
https://github.com/shsorbom/kcmsystemd-debian/tree/deb_KF5_clean
Thanks,
--Shawn