This commit:
commit 338cc038461a6c7709c5b86fd9a240209338a1ae
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>

Signed-off-by: Wolfgang Denk <wd@denx.de>

Some files didn't get updated properly with the "Use watchdog-aware
functions when calculating hashes of images" commit, this commit
fixes this.

Signed-off-by: Bartlomiej Sieka <tur@semihalf.com>
Signed-off-by: Wolfgang Denk <wd@denx.de>

Implement watchodg-aware variants of hash calculation functions:
- crc32_wd()
- md5_wd()
- sha1_csum_wd()
The above functions calculate the hash of the input buffer in chunks,
triggering the watchdog after processing each chunk. The chunk size
is given as a function call parameter.

Signed-off-by: Bartlomiej Sieka <tur@semihalf.com>

Some systems have md5.h installed in /usr/include/. This isn't the
desired file (we want the one in include/md5.h). This will avoid the
conflict. This fixes the host tools building problem by creating a new
directory for U-Boot specific header files.

[Patch by Andy Fleming, modified to use separate directory by Wolfgang
Denk]

Signed-off-by: Wolfgang Denk <wd@denx.de>
Signed-off-by: Andy Fleming <afleming@freescale.com>
Acked-by: Timur Tabi <timur@freescale.com>

        
MD5 supoprt is turned on by defining CONFIG_MD5, the digest can be then
calculated using the md5() function -- see include/md5.h for details.
		    
Signed-off-by: Bartlomiej Sieka <tur@semihalf.com>