Commits on Jun 28, 2024

1. improve cross-compile instructions and makefile support …

   Add a `--cross` argument to `configure` to indicate that the generated
   makefile's `make` should be like `make kernel`, and a pb-based
   bootstrap should rerun `configure` to build for the host machine
   instead of the specified target machine.
   
   Also, add support for `DESTDIR` as a more conventional alternative to
   the `--temproot` configure flag. While we're at it, recognize
   `CFLAGS_FOR_BUILD` for building `bin/zuo`.
   
   As part of the change to `configure`, having `CC_FOR_BUILD` set does
   not by itself disable the use of pb for creating or updating boot
   files. Depending on how boot files are obtained, `--force` now may be
   needed when using `CC_FOR_BUILD` as part of a cross compile that
   doesn't use `--cross`.

   

   mflatt committed Jun 28, 2024
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