[coreboot-gerrit] Patch merged into coreboot/master: README: improve description of compiler requirements

the following patch was just integrated into master:
commit 221761e0be8fbf5ae5cae827216ae0e92c05c3af
Author: Patrick Georgi 
Date:   Thu Jul 23 21:08:30 2015 +0200

README: improve description of compiler requirements

People run into "building bootblock without the required toolchain" too often.
    Update documentation so they don't try to use random compilers to build
    coreboot.

Change-Id: I9715b52a4bac9b886cc5627add074c04e06a0828
    Signed-off-by: Patrick Georgi 
    Reviewed-on: http://review.coreboot.org/11047
    Tested-by: build bot (Jenkins)
    Reviewed-by: Stefan Reinauer

See http://review.coreboot.org/11047 for details.

-gerrit