common: Add fixed axbo SPAC udev device name rule.

This is useful in order to set the device symlink to /dev/axbo and to ensure
that the owner is user "aszlig" (maybe this should be a group called axbo? but
we can change that later)

Signed-off-by: aszlig <aszlig@redmoonstudios.org>
rxtx: Add lockdev library to dependencies.

This is primarily to ensure that the lock files reside in /tmp/ but I wonder if
/run/lock should be set sticky on NixOS by default?

Signed-off-by: aszlig <aszlig@redmoonstudios.org>
rxtx: Use prerelease version.

The stable version cases segfaults and other issues with 64 bit, so let's move
over to the prelease version. Please have a look at:

http://rxtx.qbang.org/wiki/index.php/Talk:Download#Linux.2CAMD_64.2C_.26_2.2

Signed-off-by: aszlig <aszlig@redmoonstudios.org>