Patch merged into coreboot/master: 30901ba Persimmon: Fix warning, enable warnings as errors

the following patch was just integrated into master:
commit 30901baabcf1e26f3ba4cd32f5bd90eb1c6ed35c
Author: Martin Roth 
Date:   Sat Feb 23 15:32:11 2013 -0700

Persimmon: Fix warning, enable warnings as errors

- Fix redefinition warning for SB_GPIO_REG50 introduced in commit
         fa8702cf - http://review.coreboot.org/#/c/2446/
         Persimmon: adapt PCIe reset code copied from Inagua to actually
                     match Persimmon
         The warning being fixed is:
            SB800.h:1491, GNU Compiler 4 (gcc), Priority: Normal
            "SB_GPIO_REG50" redefined [enabled by default]

- Enable warnings as errors so no more warnings will be accidentally
         committed.

Change-Id: Ib443b2bd2067f0b7d5f93f79170899a0f8f61060
    Signed-off-by: Martin Roth 
    Reviewed-on: http://review.coreboot.org/2494
    Tested-by: build bot (Jenkins)
    Reviewed-by: Stefan Reinauer

Build-Tested: build bot (Jenkins) at Sun Feb 24 20:14:05 2013, giving +1
Reviewed-By: Stefan Reinauer  at Mon Feb 25 18:48:21 2013, giving +2
See http://review.coreboot.org/2494 for details.

-gerrit