distro/defaultsetup: Enable removal of libtool .la files by default
Relocation of native .la files during recipe specific sysroot relocation
is probably the final straw in just killing these files off.
Change things so this class is inherited by default. If distros don't want to
do this, they can opt out but it seems like the best thing to do now since
.la files aren't needed on Linux.
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
