Backport a patch to fix the build with clang 6.0.
/wrkdirs/usr/ports/net-p2p/ktorrent/work/ktorrent-4.3.1/libktcore/torrent/chunkbarrenderer.cpp:68:16: error: non-constant-expression cannot be narrowed from type 'bt::Uint32' (aka 'unsigned int') to 'int' in initializer list [-Wc++11-narrowing]
PR: 224945
Reported by: pkg-fallout