libpayload: Have make install save .xcompile file

Useful information, record it in the destination directory,
together with .config.

Change-Id: Icf3282f61f502b37f9f06d7d5a0a630f49c96ed2
Signed-off-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Reviewed-on: http://review.coreboot.org/10864
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
1 file changed