Fix opam build by making libff a git submodule #753
Merged
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We make libff a git submodule instead of cloning it while building because
"Commands executed during the build phase by opam should perform no network I/O"
Tests are still broken, hence the removal of the corresponding command in scilla.opam
I renamed
_deps
todeps
to indicate that one can no longer remove_deps
and expect things will still be working as they were.P.S. In a subsequent PR I intend to tweak CI to check that we can install Scilla as an opam package.