DragonFlyBSD/src 3f6af2c. Makefile.inc1

btools: Remove usr.bin/bzip2 from the list.

The bzip2 and its variants are not used during buildworld/buildkernel.
So avoid yet another dependency on host lib (libz2.a).
Only places i could find it referenced were:
  * etc/man.conf - for manpage compression (we only do and trac .gz ones).
  * etc/release  - for compressing the kernel sources (that is outside build
                   and already have a dependencies from DPorts).
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