coqPackages.dpdgraph: remove for Coq < 8.7

ocamlgraph is no longer available for older versions of Coq

authored by Vincent Laporte and committed by Vincent Laporte 73e2e4c0 f78667f7

-2
-2
pkgs/development/coq-modules/dpdgraph/default.nix
··· 20 { case = "8.9"; out = "0.6.5"; } 21 { case = "8.8"; out = "0.6.3"; } 22 { case = "8.7"; out = "0.6.2"; } 23 - { case = "8.6"; out = "0.6.1"; } 24 - { case = "8.5"; out = "0.6"; } 25 ] null; 26 27 release."1.0+8.18".sha256 = "sha256-z14MI1VSYzPqmF1PqDXzymXWRMYoTlQAfR/P3Pdf7fI=";
··· 20 { case = "8.9"; out = "0.6.5"; } 21 { case = "8.8"; out = "0.6.3"; } 22 { case = "8.7"; out = "0.6.2"; } 23 ] null; 24 25 release."1.0+8.18".sha256 = "sha256-z14MI1VSYzPqmF1PqDXzymXWRMYoTlQAfR/P3Pdf7fI=";