constParameterCallback false-positive with memcpy

[Steve Albright]

constParameter - Parameter 'DataToEncrypt' can be declared with const

It isn't recognizing that memcpy can affect the data.

This might be a simpler way to reproduce this one https://sourceforge.net/p/cppcheck/discussion/general/thread/dda510831e/

namespace constParameterCallbackFalsePostive
{
   struct DataToEncrypt
   {
      // cppcheck-suppress unusedStructMember - submitted separately
      static const int ENCRYPTED_DATA_BUF_SIZE = 128;

      unsigned char EncryptedDataBuf[ENCRYPTED_DATA_BUF_SIZE];
   };

   void Encrypt(DataToEncrypt& DataToEncrypt)
   {
      unsigned char data[] = "asfasd";

      memcpy(DataToEncrypt.EncryptedDataBuf, &data, sizeof(data));
   }
}

[CHR]

Oddly, there is no FP if the source parameter of memcpy is not const void*:

   //void mc(void* dst, const void* src, int size); // FP
   void mc(void* dst, const char* src, int size); // no FP

   struct DataToEncrypt
   {
      char EncryptedDataBuf[128];
   };

   void Encrypt(DataToEncrypt& DataToEncrypt)
   {
      char data[] = "asfasd";

      mc(DataToEncrypt.EncryptedDataBuf, &data, sizeof(data));
   }

[CHR]

Ticket is here: https://trac.cppcheck.net/ticket/10483