This fixes error:
tools/Unix.mk:49: *** missing separator. Stop.
that can happen if version.sh is invoked on a git repository
that contains no tags.
See https://github.com/apache/incubator-nuttx/issues/5324
Signed-off-by: Juha Niskanen <juha.niskanen@haltian.com>
This PR renames `tools/Makefile.*` to have the `.mk` extension. This PR also updates `README.md` and other files that references the other files.
Note: Skipped Makefile.host for this PR since it caused failures in CI for the sim build
By using a standard extension for Makefiles (https://www.file-extension.info/format/mk), editors will auto-format files.
This change will also improve developer ergonomics when searching for specific files
Verified locally that build still works, CI will verify more!
