Patch merged into coreboot/master: 2459aee build system: provide generic compiler flag variables

the following patch was just integrated into master:
commit 2459aeea0ba502b2d0734b8ba320b43a73d43d95
Author: Patrick Georgi 
Date:   Fri Mar 27 15:27:21 2015 +0100

build system: provide generic compiler flag variables

Introduce generic-$(type)-ccopts and $(class)-generic-ccopts
    to declare compiler flags that apply to all files of a certain
    type or of a certain class. Then use them.

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

Change-Id: I655688e82a0cc5bad89b6f55dc217b9f66b64604
    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/9114
    Tested-by: build bot (Jenkins)
    Reviewed-by: Aaron Durbin

See http://review.coreboot.org/9114 for details.

-gerrit