whacking the src/bin/sh/mk*.sh scripts altogether

[Tom Spindler <dogcow%babymeat.com@localhost>]

Instead of worrying about fixing all the generation scripts, I took a
look at the generated output for a couple of different arches:
i386, amd64, mac ppc, mac68k, sparc, sparc64, mips, alpha, and arm.

In no case were any of the generated .c or .h files different! All nine
arches have identical md5 checksums for the files.

Since this is the case, and it seems like the build process for all
of them has gotten increasingly baroque, it seems like the most
sensible thing to do is to whack the mk*.sh files and commit the
generated files into the tree.

Anybody see issues with this?