kdesrc-build: Add support for qmake .pro builds.

Really this is just an excuse to build krapyl... although I needed to
add LIBS += -lqca, and there's no install capability either here or in
krapyl.

But it only took 45 lines and the logic is reasonably straightforward
for once... maybe this refactoring has turned overall useful by now. :)

By the way for those wondering...

# eV vote verifier
# Don't bother with cmake-options or configure-flags...
module krapyl
repository kde:scratch/sune/krapyl.git
end module