ccache problem

[Henri Gomez]

> 2.4 won't be picked up by configure as it's too old. The others should work.
> From what I understand ccache should be smart enough to handle several
> builds going at the same time, but you could try isolating and see if it
> helps.

I started to provide specific ccache location for each job (one by openjdk).

I've various build time depending OS (and so ccache - gcc)

These a for fresh build, new repo, empty ccache dir :

https://gist.github.com/3832915