deltachat-repl,deltachat-rpc-server: use OpenSSL from Nixpkgs

pkgs/by-name/de/deltachat-repl/package.nix

@@ -1,6 +1,5 @@
 { rustPlatform
 , libdeltachat
-, perl
 , pkg-config
 }:
 
@@ -10,10 +9,13 @@ rustPlatform.buildRustPackage {
   inherit (libdeltachat) version src cargoLock buildInputs;
 
   nativeBuildInputs = [
-    perl
     pkg-config
   ];
 
+  env = {
+    OPENSSL_NO_VENDOR = true;
+  };
+
   cargoBuildFlags = [ "--package" "deltachat-repl" ];
 
   doCheck = false;

pkgs/by-name/de/deltachat-rpc-server/package.nix

@@ -1,6 +1,5 @@
 { rustPlatform
 , libdeltachat
-, perl
 , pkg-config
 }:
 
@@ -10,10 +9,13 @@ rustPlatform.buildRustPackage {
   inherit (libdeltachat) version src cargoLock buildInputs;
 
   nativeBuildInputs = [
-    perl
     pkg-config
   ];
 
+  env = {
+    OPENSSL_NO_VENDOR = true;
+  };
+
   cargoBuildFlags = [ "--package" "deltachat-rpc-server" ];
 
   doCheck = false;