Fix Delphi Linux StrToFloat build

[MaxLogic]

Summary

This fixes a Delphi Linux build failure in uPSUtils.StrToFloat.

On Delphi/Linux, the current implementation calls:

Val(string(s), Result, i);

where Result is Extended. That fails to compile because Delphi Linux does not support Extended as a distinct floating-point target in this context.

The patch keeps the existing Val implementation for Windows and FPC, and uses SysUtils.StrToFloat with invariant format settings only for Delphi/Linux. That preserves PascalScript's dot-decimal parsing behavior without changing the existing non-Linux path.

Verification

Verified in a downstream Delphi 12 project where the current upstream uPSUtils.pas failed during a Linux64 build with:

error E2008: Incompatible types
Val(string(s), Result, i);

After this change, the same downstream execute Linux64 Release build completes successfully.

[evgeny-k]

you can use DELPHI_LINUX condition like

{$IFNDEF DELPHI_LINUX}
var
  i: longint;
{$ENDIF}
begin
  {$IFDEF DELPHI_LINUX}
  Result := SysUtils.StrToFloat(string(s), TFormatSettings.Invariant);
  {$ELSE}
  Val(string(s), Result, i);
  if i <> 0 then raise Exception.Create(RPS_InvalidFloat);
  {$ENDIF}
end;