Add src/wallet/* code to wallet:: namespace

src/wallet/crypter.cpp

@@ -10,6 +10,7 @@
 
 #include <vector>
 
+namespace wallet {
 int CCrypter::BytesToKeySHA512AES(const std::vector<unsigned char>& chSalt, const SecureString& strKeyData, int count, unsigned char *key,unsigned char *iv) const
 {
     // This mimics the behavior of openssl's EVP_BytesToKey with an aes256cbc
@@ -136,3 +137,4 @@ bool DecryptKey(const CKeyingMaterial& vMasterKey, const std::vector<unsigned ch
     key.Set(vchSecret.begin(), vchSecret.end(), vchPubKey.IsCompressed());
     return key.VerifyPubKey(vchPubKey);
 }
+} // namespace wallet