[fpc-pascal] FPC cannot understand 1-char string as PChar

[AlexeyT via fpc-pascal]

FPC 3.3.1-r43022 [2019/09/16] for Linux x64. This code crashes, because 
fpc sees 'x', 'y' wrong:

  Py_BuildValue('{sLsisisisisisisOsOsOsisisisisisO}',
    'tag',
    Mark.Tag,
    'x',
    Mark.PosX,
    'y',
    Mark.PosY,
    'len',
    Mark.LenX,
I must change it to this, it works ok:
  Py_BuildValue('{sLsisisisisisisOsOsOsisisisisisO}',
    'tag',
    Mark.Tag,
    PChar(string('x')),
    Mark.PosX,
    PChar(string('y')),
    Mark.PosY,
    'len',
    Mark.LenX,

Py_BuildValue is from Python-for-Lazarus package.
    Py_BuildValue:      function( format: PAnsiChar {;...}): PPyObject; 
cdecl varargs;

--
Regards,
Alexey

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