Adding support for sunos 32-bit

First pass at sunos support. I provided a binary built from: http://downloads.sourceforge.net/project/libjpeg-turbo/1.2.90%20%281.3beta1%29/libjpeg-turbo-1.2.90.tar.gz

And it passes the tests ran by prebuild.js:

      $ node pre-build.js

      3 tests complete (268 ms)

    pre-build test passed successfully, skipping build...