git dependencies with submodules

[freevryheid]

Discussed in #813

^{Originally posted by freevryheid December 19, 2022}
not sure if the fpm sources can be updated to pull submodules by default for git dependencies.

When cloning from the cli I'd use:

git clone --recurse-submodules [email protected]:freevryheid/fwalk.git

but fpm doesn't appear to "clone" so perhaps add a step:

git submodule update --init --recursive

[freevryheid]

see PR #816