Log Message:
Update gcc3 to gcc3-3.3nb2
If NetBSD and /usr/include/pthread.h is present, add --enable-threads to
configure arguments. Could set --host=i386--netbsdelf2.0 instead, but that
causes many other packages (eg: mail/imap-uw) to fail to link with
    '/usr/bin/ld: cannot find -lgcc_eh'
even when they
    .if defined(USE_GCC3)
    .  include "../../lang/gcc3/buildlink2.mk"
    .endif
With this change a 1.6U/i386 machine can build mozilla with gcc3.