Build with bfd and gold linker, but use bfd linker per default
and make sure that lto is enabled in both binutils and gcc
Change-Id: I0584396b4580674cfdca24fbed0d8eeb1ee38806
Signed-off-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Reviewed-on: http://review.coreboot.org/10496
Tested-by: build bot (Jenkins)
Reviewed-by: Edward O'Callaghan <edward.ocallaghan@koparo.com>