Patch merged into coreboot/master: libpayload: Use top level xcompile

the following patch was just integrated into master:
commit f53dbfaa8c20cd789afc7e54ff004d068095223c
Author: Stefan Reinauer 
Date:   Thu Jul 9 00:26:49 2015 +0200

libpayload: Use top level xcompile

Instead of having a second copy that already within 2-3 days
    becamer quite outdated, use the same xcompile copy for coreboot
    and libpayload, as we do with Kconfig already.

This requires a simple change to the top level xcompile to understand
    both CONFIG_COMPILER_GCC and CONFIG_LP_COMPILER_GCC (only one of
    them will occur at the same time)

libpayload's .xcompile target was moved later so that it can make use
    of $(top)

Change-Id: I44001067f551cd0776dd303cbaeaa40eb3d5c1db
    Signed-off-by: Stefan Reinauer 
    Reviewed-on: http://review.coreboot.org/10863
    Tested-by: build bot (Jenkins)
    Reviewed-by: Patrick Georgi

See http://review.coreboot.org/10863 for details.

-gerrit