Fix some compiler warnings

The filter_name should really be passed to the macro, so leave that warning
unfixed for now.
Don't require Xvfb to be in /usr/bin
Work around incorrect unpacking of ij-latest.zip by libarchive

libarchive incorrectly unpacks Zip file members added by Python zipfile:
http://code.google.com/p/libarchive/issues/detail?id=300

Create ij-latest.zip entirely with zip and unzip.

Closes #1.
Log ImageJ version to stdout at runtime
Stop forcing 32-bit build