icedtea6: CORBA backports broke bootstrap build

[Stefan Ring]

> Do you have this changeset?
>
> http://icedtea.classpath.org/hg/icedtea6/rev/55241b2310b8

Yes, I used the latest one available.
http://icedtea.classpath.org/hg/icedtea6/rev/8f6318c8c2f4

> Also, make sure you're building out of tree or have a clean source directory.

I'm building in tree, and definitely completely clean. My build script
always deletes the entire tree before building. I'll try building
out-of-tree for a change...