fix(nix): use system openssl for rust builds

Author: saffr3n

nix/packages.nix

@@ -3,10 +3,9 @@ let
   mkPackage =
     x:
     {
-      lib,
       rustPlatform,
-      stdenv,
       pkg-config,
+      openssl,
     }:
     let
       cargoToml = builtins.fromTOML (builtins.readFile /${root}/crates/${x}/Cargo.toml);
@@ -15,17 +14,18 @@ let
       pname = cargoToml.package.name;
       version = cargoToml.package.version;
 
+      strictDeps = true;
+
       src = root;
       cargoLock.lockFile = root + /Cargo.lock;
 
       nativeBuildInputs = [ pkg-config ];
-      buildInputs = [ stdenv.cc.cc.lib ];
+      buildInputs = [ openssl ];
 
-      buildAndTestSubdir = "crates/${x}";
+      # Needed to get openssl-sys to use pkg-config.
+      env.OPENSSL_NO_VENDOR = 1;
 
-      postFixup = lib.optionalString (!stdenv.hostPlatform.isDarwin) ''
-        patchelf --set-rpath "${stdenv.cc.cc.lib}/lib" $out/bin/${x}
-      '';
+      buildAndTestSubdir = "crates/${x}";
     };
 in
 (builtins.listToAttrs (