Get rid of gensend target & cached git version.

Get rid of gensend target & cached git version.

- Change the developer flow to not require updating the git-version repo
  that the builds used to download a git-version.h file. The Actions now
  do a full repo fetch so that the .h file can be generated via the git
  history.
- Get rid of the gensend Makefile target that was used for the above.
- Get rid of the pre-push git hook file that called "Make gensend".
- Change the FreeBSD build to save an artifact with its built binaries.

[buildall]