Fix build-deps for build on Ubuntu 12.04

libboost-filesystem-dev (>= 1.48) causes outdated boost to be installed
other deps are xml related and fix errors like this:
```
a2x: ERROR: xmllint --nonet --noout --valid /root/lizardfs-2.5.0/build-pack/doc/lizardfs-probe.8.xml returned non-zero exit status 127
```