Re-implemented ecj support

[Lillian Angel]

Andrew Haley wrote:
> Lillian Angel writes:
>  > Be aware that the build is broken on x86_64 because of this bug in b22:
>  > http://bugs.sun.com/view_bug.do?bug_id=6616627
>  > 
>  > It will be fixed when we upgrade to b23/b24.
>
> How come we didn't notice this before now?
>   

The bug was only introduced in b22,  I have built on x86_64 since then, 
but never tried bootstrapping with itself.  Berhard Rosenkraenzer did 
encounter this: See mail with subject "Re: bootstrapping icedtea with 
gcj 4.3" from Oct 23.

Lillian