[rfc][icedtea-web] fix unit tests when installed dir != build dir

[Jiri Vanek]

On 12/06/2012 03:51 PM, Adam Domurad wrote:
> 2012-12-06  Adam Domurad  <adomurad at redhat.com>
>
>      * Makefile.am: Fix unittest plugin classes locations to not rely on
>      installed directory.

looks like it fixed the issue. Thanx.
Please mention affected targets in changelog.

after the change, approved.

J.