bzip2 support on solaris

[Matt Selsky]

> I suspect you are using an old version of bzlib.  1.0.2 (two years old
> now) includes stdio.h automatically.
> 
> What version of bzlib do you have installed?  Also, did you install it
> yourself, or is this version of bzlib standard with Solaris?  I need
> to think about how to have autoconf detect this automatically.

According to /usr/include/bzlib.h:

  bzip2/libbzip2 version 1.0 of 21 March 2000

This is the version of bzlib that ships with Solaris (package is called
SUNWbzip).