simplify the bzip2 configuration

I believe that a simple 'make' and 'make install' will suffice for what
we need from bzip2.
Update the mysql source url

The previous source URL was being problematic, so moved to a new source
Add libreadline and move bzip2 higher

Normally we would make bzip2 a dependency for Python, but as we dont
'own' the Python configuration (it is being pulled from
omnibus-software) just make sure it is higher in order than Python.