net-p2p/bitmessage: Update to 0.6.2

Also:

• add runtime dependencies on devel/py-qt4-core, net/py-qt4-network x11-toolkits/py-qt4-gui, devel/py-msgpack-python, and devel/py-pyopencl
• use gmake
• remove Makefile, src/bitmsghash_Makefile patches
• add setup.py patch
• add USE_PYTHON=distutils autoplist

PR: 217856
Submitted by: yuri@rawbw.com (maintainer)
Approved by: swills (mentor, implicit)