[icedtea patch] unbreak builds with ANT_HOME != /usr

[Lillian Angel]

Matthias Klose wrote:
> This was introduced between b19 and b21, couldn't find anything in the
> changelog. At least on Ubuntu and Debian ANT_HOME is /usr/share/ant.
>   

Thanks for this, I was planning to add this today :)

I will commit it for you.
Lillian

>   Matthias
>