[platform-releng-dev] releng changes for RC3

[David M Williams <david_williams@xxxxxxxxxx>]

I've updated our Orbit maps to point to
(we hope) the final Orbit URL for Juno 
Bug 380970
- Update orbit maps to R20120526062928 

More importantly for RC3, I have updated
the version of JDT compiler used in our build, to the compiler produced
for RC2. 
Bug 379593
- Update basebuilder to final? JDT compiler for Juno 

But, it is already known that we will
updated the compiler once again, after JDTs final fixes. 
Comment/follow bug 379593 in interested.


Thanks,