[coreboot] Patch merged into coreboot/master: 52fb5c4 buildgcc: Remove the warning options unsupported by cygwin

the following patch was just integrated into master:
commit 52fb5c40890ac7bf4abba38564c483c748c915aa
Author: zbao 
Date:   Wed Aug 8 19:25:04 2012 +0800

buildgcc: Remove the warning options unsupported by cygwin

My cygwin hostcc doesn't support
    -Wempty-body -Waddress -Wmissing-field-initializers

Change-Id: I879e05f3bd396b36b327f204252e820552b6e12e
    Signed-off-by: Zheng Bao 
    Signed-off-by: zbao

Build-Tested: build bot (Jenkins) at Wed Aug  8 12:35:06 2012, giving +1
Reviewed-By: Anton Kochkov  at Wed Aug 15 08:09:57 2012, giving +2
See http://review.coreboot.org/1426 for details.

-gerrit