[coreboot] Patch merged into coreboot/master: 505e9a5 nvramtool: Allow build under Cygwin

the following patch was just integrated into master:
commit 505e9a5a945b811c0cda86d49b43947a0c14947c
Author: Raymond Danks 
Date:   Fri Apr 27 08:46:55 2012 -0600

nvramtool: Allow build under Cygwin

To build under Cygwin, nvramtool depends upon the package ioperm:
    http://openwince.sourceforge.net/ioperm/

for sys/io.h and sys/perm.h.  This change causes the nvramtool make to correctly include and link against these headers and libraries.

Change-Id: If6cd9d324de7bc19830e0018844f42761b28ddd3
    Signed-off-by: Raymond Danks

Build-Tested: build bot (Jenkins) at Fri Apr 27 17:14:44 2012, giving +1
See http://review.coreboot.org/940 for details.

-gerrit