wip/u-boot-tools

[Brook Milligan <brook%nmsu.edu@localhost>]

I have created a wip package for (some of) the U-Boot tools.  For now, they are just mkimage and dumpimage, which are useful for converting a file of U-Boot commands into a bootable script file, e.g., boot.scr.  

Before I commit this to pkgsrc, I would appreciate eyes reviewing it.  If there are better ways of compiling this than the two patches, I would appreciate input.

Thanks a lot.

Cheers,
Brook