elftosb: Cross Build

From https://github.com/Freescale/meta-fsl-arm/blob/master/recipes-bsp/elftosb/files/cross-build.patch

Signed-off-by: Robert Nelson <robertcnelson@gmail.com>
elftosb: don't use full path for headers

This fixes the building on new host distributions where header might
move due multilib support and other possible changes in future.

Upstream-Status: Pending

From: https://github.com/Freescale/meta-fsl-arm/blob/master/recipes-bsp/elftosb/files/don-t-use-full-path-for-headers.patch

Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>
Signed-off-by: Robert Nelson <robertcnelson@gmail.com>