This commit:
commit 338cc03846
Author: Wolfgang Denk <wd@denx.de>
Date: Fri Jun 6 14:28:14 2008 +0200
tools/mkimage: fix compiler warnings on some systems.
Broke building on some systems, because the host's string.h was interfering
with u-boot's linux/string.h. It doesn't look like we need the u-boot one if
we're building for the host, so now we only include when building inside
u-boot.
Signed-off-by: Andy Fleming <afleming@freescale.com>