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ExternalProject: Fix git submodule recursion on update

Charis Marangos requested to merge zoodinger/cmake:_ep_option_no_recursive_gitupdate_fix into master

In !3923 (merged) we implemented the feature in the clone script written by _ep_write_gitclone_script but not in the update script written by _ep_write_gitupdate_script. Implement the latter by factoring out a common helper to use in both places.

I think that unfortunately none of the existing tests for the update step of ExternalProject_Add cover for testing the update step with submodules, and that this was a problem before my initial contribution.

Fixes: #20335 (closed)
Backport: release
Topic-rename: ExternalProject-submodules-recurse

Edited by Brad King

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