verasco: remove unmaintained project

Verasco is no longer maintained by upstream and blocks updates of some libraries.
Removing it also makes it possible to remove coq 8.4.

pkgs/development/tools/analysis/verasco/default.nix

@@ -1,51 +0,0 @@
-{ stdenv, lib, fetchurl
-, coq, ocaml, findlib, menhir, zarith
-, tools ? stdenv.cc
-}:
-
-assert lib.versionAtLeast ocaml.version "4.02";
-
-stdenv.mkDerivation rec {
-  name = "verasco-1.3";
-  src = fetchurl {
-    url = "http://compcert.inria.fr/verasco/release/${name}.tgz";
-    sha256 = "0zvljrpwnv443k939zlw1f7ijwx18nhnpr8jl3f01jc5v66hr2k8";
-  };
-
-  buildInputs = [ coq ocaml findlib menhir zarith ];
-
-  preConfigure = ''
-    substituteInPlace ./configure --replace '{toolprefix}gcc' '{toolprefix}cc'
-  '';
-
-  configureFlags = [
-    "-toolprefix ${tools}/bin/"
-    (if stdenv.isDarwin then "ia32-macosx" else "ia32-linux")
-  ];
-
-  prefixKey = "-prefix ";
-
-  enableParallelBuilding = true;
-  buildFlags = "proof extraction ccheck";
-
-  installPhase = ''
-    mkdir -p $out/bin
-    cp ccheck $out/bin/
-    ln -s $out/bin/ccheck $out/bin/verasco
-    if [ -e verasco.ini ]
-    then
-      mkdir -p $out/share
-      cp verasco.ini $out/share/
-    fi
-    mkdir -p $out/lib/compcert
-    cp -riv runtime/include $out/lib/compcert
-  '';
-
-  meta = {
-    homepage = http://compcert.inria.fr/verasco/;
-    description = "A static analyzer for the CompCert subset of ISO C 1999";
-    maintainers = with stdenv.lib.maintainers; [ vbgl ];
-    license = stdenv.lib.licenses.unfree;
-    platforms = with stdenv.lib.platforms; darwin ++ linux;
-  };
-}

pkgs/top-level/all-packages.nix

@@ -8984,10 +8984,6 @@ with pkgs;
 
   qcachegrind = libsForQt5.callPackage ../development/tools/analysis/qcachegrind {};
 
-  verasco = ocaml-ng.ocamlPackages_4_02.verasco.override {
-    coq = coq_8_4;
-  };
-
   visualvm = callPackage ../development/tools/java/visualvm { };
 
   vultr = callPackage ../development/tools/vultr { };

pkgs/top-level/ocaml-packages.nix

@@ -1024,16 +1024,6 @@ let
 
     omake_rc1 = callPackage ../development/tools/ocaml/omake/0.9.8.6-rc1.nix { };
 
-    verasco = callPackage ../development/tools/analysis/verasco ((
-      if system == "x86_64-linux"
-      then { tools = pkgs.pkgsi686Linux.stdenv.cc; }
-      else {}
-    ) // {
-      menhir = callPackage ../development/ocaml-modules/menhir {
-        version = "20170712";
-      };
-    });
-
     google-drive-ocamlfuse = callPackage ../applications/networking/google-drive-ocamlfuse { };