Potential out-of-range or memory access error in `UEncodings` unit

[delphidabbler]

In WideCharToChar in UEncodings the 1st call to WideCharToMultiByte passes reference to Dest array, before that array's size has been set. Instead of passing Dest, nil should be passed here.

Instead of

  BufSize := WideCharToMultiByte(
    CodePage, 0, @Source, 1, @Dest[0], 0, nil, nil
  );

uses

  BufSize := WideCharToMultiByte(
    CodePage, 0, @Source, 1, nil, 0, nil, nil
  );

[delphidabbler]

Noticed this in caboli branch where Delphi 11.3 threw a range error in this routine. Already applied the fix there.

[delphidabbler]

Fixed at commit e43816c