chuck 51659857a7 add parent directory search for make as discussed on tech-toolchain.
- new dir.c function: Dir_FindHereOrAbove:
      Search for a path in the current directory and then all the directories
      above it in turn until the path is found or we reach the root ("/").
 - add hooks to use it in main.c for -m and syspath (compiled in
      _PATH_DEFSYSPATH and $MAKESYSPATH).
 - updated man page
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