More fixes for the build system: this is the "harmless" part of the

patch used by Debian (and made by Simon Edwards himself) which adds the
"protected is public" hack to allow for proper building with SIP 4.15+.

PyKDE4 needs some code adjustments, however: those exist in patch form
(see bug) but aren't yet committed. Simon, should I push them already,
or should I wait till the issues on ARM are resolved?

CCMAIL: simon@simonzone.com
CCBUG: 323950