Addi an exception for core2 & corei to NBI on 32-bit kFreeBSD, NetBSD, and OpenBSD

These binaries are identical on 32-bit kFreeBSD, NetBSD, and OpenBSD systems.
If a corei CPU is found on these systems we'll use the core2 jbigi binary.

194868,ad47c3d909d0fb85242566f3c7b4be5b,libjbigi-kfreebsd-core2.so
194868,ad47c3d909d0fb85242566f3c7b4be5b,libjbigi-kfreebsd-corei.so
202848,57aa013ca310f3aae990f5ee78c100bd,libjbigi-netbsd-core2.so
202848,57aa013ca310f3aae990f5ee78c100bd,libjbigi-netbsd-corei.so
207657,01483211b6e077057302e256f185f7e7,libjbigi-openbsd-core2.so
207657,01483211b6e077057302e256f185f7e7,libjbigi-openbsd-corei.so

The I2P project does not currently ship these binaries, but they can be found
in unofficial jbigi packages.