Precise sysroots available

[Marcin Juszkiewicz]

I added Ubuntu 12.04 'precise' based sysroots to Jenkins yesterday. They
are built using 'armhf' architecture and available in three flavours:

- alip
- nano
- ubuntu-desktop

So far only -dev ones are present, will work on -dbg ones soon.

We have 'nano' one built and available to fetch at
http://snapshots.linaro.org/precise/images/nano-dev/ - rest will be
built when there will be machine free to do that.

They will also be moved to http://snapshots.linaro.org/precise/sysroots/
to not make people try to boot them ;)

Please take a look do they work as you want and tell me what kind of
changes you would like to have, which images are not needed, which
should be added. Are there any users for -dbg style sysroots?