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Brad King authored
Since commit 272779ce (ExternalProject: Allow TLS_VERIFY for git clones, 2016-04-01) we pass the `-c http.sslVerify=false` option to `git clone` even if no explicit `TLS_VERIFY` option was set. This changes behavior because we used to use the default Git behavior by default. Revise the logic to preserve the old default behavior by passing the new option only if `TLS_VERIFY` was explicitly passed as `OFF`. While at it, also honor `CMAKE_TLS_VERIFY` if the explicit `TLS_VERIFY` option is not given.
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