Patch merged into coreboot/master: 828e0e8 build system: run linker scripts through the preprocessor

the following patch was just integrated into master:
commit 828e0e86f3b7ddb7cde5daddc83be4386a4d43b1
Author: Patrick Georgi 
Date:   Sat Apr 4 15:50:20 2015 +0200

build system: run linker scripts through the preprocessor

This allows combining and simplifying linker scripts.

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

Change-Id: Ie5c11bd8495a399561cefde2f3e8dd300f4feb98
    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/9303
    Tested-by: build bot (Jenkins)
    Reviewed-by: Stefan Reinauer

See http://review.coreboot.org/9303 for details.

-gerrit