diffutils: Added perl to support ptest & Skipped one test case
Added perl to the run-time dependency of the recipe for diffutils since
it is required by the test "large-subpot".
The test "strip-trailing-cr" is skipped since it requires valgrind to
work, but valgrind is considered too heavy-weight for diffutils package.
Signed-off-by: Peiran Hong <peiran.hong@windriver.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
