[coreboot] Patch merged into coreboot/master: 70c85ea build system: Retire REQUIRES_BLOB

the following patch was just integrated into master:
commit 70c85eab83564a9a5533afa16d4aa95416fb4424
Author: Patrick Georgi 
Date:   Sat Feb 16 01:06:57 2013 +0100

build system: Retire REQUIRES_BLOB

REQUIRES_BLOB assumes that all blob files come from the 3rdparty directory,
    builds failed when all files were configured to point to other sources.

This change modifies the blob mechanism so that cbfs-files can be tagged as
    "required" with some specification what is missing.

If the configured files can't be found (wrong path, missing file), the build
    system returns a list of descriptions, then aborts.

Change-Id: Icc128e3afcee8acf49bff9409b93af7769db3517
    Signed-off-by: Patrick Georgi 
    Reviewed-on: http://review.coreboot.org/2418
    Tested-by: build bot (Jenkins)
    Reviewed-by: Martin Roth 
    Reviewed-by: Paul Menzel 
    Reviewed-by: Marc Jones

See http://review.coreboot.org/2418 for details.

-gerrit