Perl packages should know about arch so that they could install to the
correct libdir. Or else they always install to the default libdir in
multilib builds.
(From OE-Core rev: a6b186a1a5cfc6ae9c099af0ed4217d91f5d4ef3)
Signed-off-by: Jesse Zhang <sen.zhang@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>