* Fix egg: initialize git submodules during install
The Pumpkin repo uses pumpkin-plugin-wit as a git submodule, but the
install script only does 'git clone --depth 1' without --recurse-submodules.
Add 'git submodule update --init --recursive --depth 1' after checkout
so the WIT files required by bindgen!/wit_bindgen::generate are available.
* Potential fix for pull request finding
