If a machine is not known, abort.
- Emulate "mkdir -p" for Old "mkdir" programs on some host OS's.
- Add "-a" option to provide MACHINE_ARCH explicitly (for MACHINEs
that are capable of having more than one MACHINE_ARCH, such as sh3
and sparc64)
- Where "getopts" is not available in the shell, try using "getopt".
It's not whitespace compatible, but works in most cases.
- Rename "bmake" to "nbmake" per suggestions.
- When building nbmake, create a temporary directory for the purpose
of holding host compiler objects that might be created in the cwd.
Delete this directory if aborted via sh's "trap".
- Create a wrapper script in $TOOLDIR/bin called "nbmake-$MACHINE",
which can be run by hand for building parts of a cross tree easily.
Use this script when finally starting the build.
