Bugfix Tools::CodeView2::GutterView - do not redraw gutter if its not shown. This actually fixes DNU when CodeView2 is used in diff view. Then the second gutter is not shown and #yOfTextViewLine: returns nil (bad) which leads to DNU.

@REM -------
@REM make using tcc compiler
@REM type tccmake, and wait...
@REM do not edit - automatically generated from ProjectDefinition
@REM -------
make.exe -N -f bc.mak USETCC=1 %1 %2