Make TThread.GetSystemTimes on Linux non-allocating

Regarding new code: af3ebf14

Code has part:

  Function GetNextWord(var l : String) : String;

  var
    P : Integer;

  begin
    P:=Pos(' ',L);
    if P=0 then 
      P:=Length(L)+1;
    Result:=Copy(L,1,P-1);
    Delete(L,1,P);
    L:=Trim(L);
  end;

which is allocating, and also it changes the l string. It parses line like this:

cpu  21222 749 13319 106681 313 0 192 0 0 0

I suggest to rewrite this parsing, w/o allocating strings, without Trim and Delete. Example: When we step on 'digit' char '1' of number '1234', we can read the entire number by loop like this:

1234 = (((1*10)+2)*10+3)*10+4