[PATCH] Support building Org from shallow clone [9.6.1 (release_9.6.1-137-gecb62e @ /home/n/.emacs.d/elpaca/builds/org/)]

[No Wayman]

In order to properly generate org-version.el, the current build in 
mk/targets.mk requires a query of the repo's tags. Shallow clones 
do not have tags and so org-version will be generated as "N/A". In 
the attached patch, support for generating org-version.el from 
shallow clones is added. It is done by querying the upstream 
remote via git ls-remote and parsing the output. In this case, a 
more well formed org-version string will be generated. However, it 
will be missing the "commits since last tag" information. e.g.

"release_9.6.1-n/a-gabc123"

0001-mk-targets.mk-GITVERSION-support-shallow-repo-clones.patch
Description: Text Data

Emacs  : GNU Emacs 30.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ 
Version 3.24.36, cairo version 1.17.6)
of 2023-01-08
Package: Org mode version 9.6.1 (release_9.6.1-137-gecb62e @ 
/home/n/.emacs.d/elpaca/builds/org/)