new package fetch-freebsd: small http(s) client library

[*] smaller than curl, maybe not maximally small

pkgs/default.nix

@@ -54,6 +54,7 @@ in {
 
   anoia = callPackage ./anoia { };
   devout = callPackage ./devout { };
+  fetch-freebsd = callPackage ./fetch-freebsd { };
   fennel = callPackage ./fennel { };
   fennelrepl = callPackage ./fennelrepl { };
   firewallgen = callPackage ./firewallgen { };

pkgs/fetch-freebsd/default.nix

@@ -0,0 +1,25 @@
+{
+  cmake,
+  stdenv,
+  openssl,
+  fetchFromGitHub
+}: stdenv.mkDerivation {
+  pname = "fetch-freebsd";
+  version = "v12.0.11";
+  src = fetchFromGitHub {
+    owner= "jrmarino";
+    repo = "fetch-freebsd";
+    rev =  "v12.0.11";
+    hash = "sha256-nLNqjQFV9x2NntBdUlabxjS9q+er28zi8uXjWvCK2Ps=";
+  };
+  cmakeFlags = [
+    "-DFETCH_PROGRAM=OFF"
+    "-DFETCH_LIBRARY=ON"
+    "-DUSE_SYSTEM_SSL=ON"
+  ];
+  nativeBuildInputs = [ cmake ];
+  buildInputs = [ openssl ];
+  postInstall = ''
+    rm -r $out/lib/lib*.a
+  '';
+}