[ntcore] NetworkTableInstance: Suppress unused lambda capture warning (#5947)

Clang warns that the "this" capture is not required, even though a
member function is being called.

ntcore/src/main/native/include/networktables/NetworkTableInstance.inc

@@ -257,6 +257,12 @@ inline void NetworkTableInstance::AddSchema(std::string_view name,
   ::nt::AddSchema(m_handle, name, type, schema);
 }
 
+// Suppress unused-lambda-capture warning on AddSchema() call
+#ifdef __clang__
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wunused-lambda-capture"
+#endif
+
 template <wpi::ProtobufSerializable T>
 void NetworkTableInstance::AddProtobufSchema(wpi::ProtobufMessage<T>& msg) {
   msg.ForEachProtobufDescriptor(
@@ -273,4 +279,8 @@ void NetworkTableInstance::AddStructSchema() {
   });
 }
 
+#ifdef __clang__
+#pragma clang diagnostic pop
+#endif
+
 }  // namespace nt