An upcoming vboot feature [1] will need strcat() to be defined in string.h. Therefore, add strcat() and strncat() to commonlib/bsd. Remove those functions from libpayload. [1] https://chromium-review.googlesource.com/c/chromiumos/platform/vboot_reference/+/5650810 Change-Id: If02fce0eafb4f6fa01d8bab17d87a32360f4ac83 Signed-off-by: Yu-Ping Wu <yupingso@chromium.org> Reviewed-on: https://review.coreboot.org/c/coreboot/+/83765 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Julius Werner <jwerner@chromium.org>