Charis Marangos 0ba8010255 ExternalProject: Fix git submodule recursion on update ...

In commit 5bc6230741 (ExternalProject: Option to turn off recursive
update of git submodules, 2019-10-16) 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.

Fixes: #20335

2020-02-11 10:14:42 +11:00

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