Fix for broken dependencies in Saucy

All this is caused by missing Debian dependencies in old libmrpt-dev packages.
When saucy gets old enough, all lines will collapse to the unique right dependency (libmrpt-dev), but as long as saucy is supported we must add the other packages manually.
Merge pull request #6578 from jlblancoc/patch-1

Fix for broken dependencies in Saucy