modified the ENVIRONMENT file to look in ${PREFIX}/share/java. As
nothing else was changed to install any files in the modified
location, just keep everything simple and sane, and standardise on
${PREFIX}/share/kaffe.
If we change this in the future, all occurrences should be changed.
Add restriction on mirroring of distfile via MIRROR_DISTFILE.
Add ONLY_FOR_ARCHS=i386, as that's the only architecture on which this
package has been tested. When I get success reports from people on other
platforms, this restriction can be relaxed.