openapi-tui: Fix gcc15 build (#479002)

pkgs/by-name/op/openapi-tui/package.nix

@@ -3,6 +3,7 @@
   rustPlatform,
   fetchFromGitHub,
   pkg-config,
+  oniguruma,
   openssl,
 }:
 
@@ -19,10 +20,17 @@ rustPlatform.buildRustPackage rec {
 
   cargoHash = "sha256-911ARjYvTNqLVVUWxATbtiKXOC9AqalFvDvp/qAef1Q=";
 
-  env.OPENSSL_NO_VENDOR = true;
+  # Do not vendor Oniguruma
+  env = {
+    RUSTONIG_SYSTEM_LIBONIG = true;
+    OPENSSL_NO_VENDOR = true;
+  };
 
   nativeBuildInputs = [ pkg-config ];
-  buildInputs = [ openssl ];
+  buildInputs = [
+    openssl
+    oniguruma
+  ];
 
   meta = {
     description = "Terminal UI to list, browse and run APIs defined with openapi spec";