(Yet another) guide to cross compiling the orocos toolchain

For what it's worth, here is another howto


This method is quite painless, because there is no need to cross-compile
the various supporting stuff like boost, libxml2, omniorb etc. Instead,
we use xapt.

The howto is attached in markdown format, if anyone wants to put it on
the orocos wiki.

Just my way of saying thanks for the good help I receive here :)