fix: TStopwatch.GetTimeStamp return wrong value under Linux

packages/vcl-compat/src/system.diagnostics.pp

@@ -178,7 +178,7 @@ var
 
 begin
   clock_gettime(CLOCK_MONOTONIC, @res);
-  Result:=((StopWatchResolution*res.tv_sec)+res.tv_nsec) div 100;
+  Result:=((Int64(1000000000)*res.tv_sec)+res.tv_nsec) div 100;
 end;