Add more static binaries to the native-xtools target. These help speed
up the cross builds significantly.

adding:
bin/sh
bin/csh
sbin/md5
usr.bin/bzip2
usr.bin/fetch
usr.bin/gzip
usr.bin/tar
usr.bin/unzip
usr.bin/xz

Phabric: D1146
Reviewed by: imp bdrewery
MFC after: 2 weeks