Make TOOL_SED, to allow using our own sed in cases where the host's version
is busted in some way.

The TOOL_SED doesn't use TIOCGWINSIZE, and has some changes to include
nbtool_config.h in a cross b

Make TOOL_SED, to allow using our own sed in cases where the host's version
is busted in some way.

The TOOL_SED doesn't use TIOCGWINSIZE, and has some changes to include
nbtool_config.h in a cross build environment.

Combined with some other changes (not yet committed), this allows cross
compiling m68k code on Solaris 10/amd64.

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