Enable bzip2
Merge pull request #520 from pyhalov/bzip2

Enable bzip2
Add dulwich
Merge pull request #521 from pyhalov/dulwich

Add dulwich
-Bsymbolic causes libpython.so to be linked incorrectly
Merge pull request #522 from pyhalov/python

-Bsymbolic causes libpython.so to be linked incorrectly