zlib not available to packages

[akbertram]

zlib is bundled with R and some packages like XVectors link against it.

We have two options here:

1. Either compile the original zlibc source with GCC-Bridge
2. Map the zlib API to Java's GZipInputStream/GZipOutputStream API

Neither of these sound particularly fun.

References:

1. Zlib Howto

[akbertram]

zlibbioc is actually building now because it relies on system library for unix machines.