When building the toolchain under BSDs, this missing backslash is needed. Change-Id: I40b0adaa73b241713493fd74f24c93f85e7aabbe Signed-off-by: Martin Roth <martinr@coreboot.org> Reviewed-on: https://review.coreboot.org/28362 Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net> Reviewed-by: Idwer Vollering <vidwer@gmail.com> Tested-by: build bot (Jenkins) <no-reply@coreboot.org>