Patch merged into coreboot/master: 10f86b0 build system: generalize src-to-obj

the following patch was just integrated into master:
commit 10f86b0bd8c294870dd3026d1dd55835303c416f
Author: Patrick Georgi 
Date:   Fri Mar 27 16:56:23 2015 +0100

build system: generalize src-to-obj

It can now be used on any list of files instead of assuming
    to work on $($(class)-src).

This is inspired by the commit listed below, but rewritten to match
    upstream, and split in smaller pieces to keep intent clear.

Change-Id: Ib77afedd4c3f847963497beea503f5447a7c6e28
    Signed-off-by: Patrick Georgi 
    Based-On-Change-Id: I50af7dacf616e0f8ff4c43f4acc679089ad7022b
    Based-On-Signed-off-by: Julius Werner 
    Based-On-Reviewed-on: https://chromium-review.googlesource.com/219170
    Reviewed-on: http://review.coreboot.org/9161
    Tested-by: build bot (Jenkins)
    Reviewed-by: Aaron Durbin 
    Reviewed-by: Paul Menzel

See http://review.coreboot.org/9161 for details.

-gerrit