After Ctrl+C is pressed to interrupt bitbake, it loops continually, running
at 100% cpu. This patch selects on the correct file descriptors resolving
the excess cpu usage.
(Bitbake rev: 497404e8484b7ca7c11e459bf0845642156eb677)
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>