prolog_pack: only check for git dir if git(false) is not in options #1307
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Per #1305, currently trying to install a pack from a local dir will fail if git is not present, even if git would not be required to run the install.
This PR modifies the behavior of
pack_unpack_from_local/5
to check the options for an explicitly setgit(false)
, in which case the check for a git directory is skipped.