libgcj/8933: Install libffi and boehm-gc headers

[tromey@gcc.gnu.org]

Synopsis: Install libffi and boehm-gc headers

Responsible-Changed-From-To: unassigned->tromey
Responsible-Changed-By: tromey
Responsible-Changed-When: Tue Dec 31 09:46:03 2002
Responsible-Changed-Why:
    I'm handling this.
    I have a patch to make libffi be installed
    and another to not install the boehm-gc headers.

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=8933