RFC : enable libgcj on freebsd-x86_64

[Tom Tromey]

>>>>> "Arno" == Arno J Klaassen <arno@heho.snv.jussieu.fr> writes:

Arno> since January commits to boehm-gc for handling amd64/x86-64 cpu under
Arno> GNU/kFreeBSD, I confirm that libgcj-support is OK for x86_64*freebsd
Arno> (which closes bug http://gcc.gnu.org/bugzilla/show_bug.cgi?id=25652).
Arno> Testsuite gives 17 failures on -head, 22 on 4_2_branch.

What are the failures?

Arno> Could someone please commit the attached patch to configure.ac and
Arno> regenerate configure?

It seems reasonable to me, but some top-level build maintainer will
have to approve it.

Tom