libgit2 on ubuntu 18.04 has a bad dependency
libgit2 on ubuntu 18.04 has a bad dependency

Summary: Ubuntu 18.04 libgit2 has clash with libcurl4-openssl-dev as it depends on libcurl4-gnutls-dev.  Should be ok from 20.04 again.  There is a description at https://github.com/r-hub/sysreqsdb/issues/77

Reviewed By: Croohand

Differential Revision: D32833245

fbshipit-source-id: 0ee6b8905e3b497c78763258b7508db731c85e70

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