* lang/cpp/src/configuration.h (Component, Option),
lang/cpp/src/data.h (Data),
lang/cpp/src/decryptionresult.h (DecryptionResult,
DecryptionResult::Recipient),
lang/cpp/src/encryptionresult.h (EncryptionResult, InvalidRecipient),
lang/cpp/src/engineinfo.h (EngineInfo),
lang/cpp/src/importresult.h (ImportResult, Import),
lang/cpp/src/key.h (Key, Subkey, UserID, UserID::Signature),
lang/cpp/src/keygenerationresult.h (KeyGenerationResult),
lang/cpp/src/keylistresult.h (KeyListResult),
lang/cpp/src/notation.h (Notation),
lang/cpp/src/signingresult.h (SigningResult, InvalidSigningKey,
CreatedSignature),
lang/cpp/src/swdbresult.h (SwdbResult),
lang/cpp/src/tofuinfo.h (TofuInfo),
lang/cpp/src/verificationresult.h (VerificationResult, Signature),
lang/cpp/src/vfsmountresult.h (VfsMountResult): Explitily declare
compiler generated copy constructor.