Visual Studio's native tool command prompt uses these FOR loop variables: %%1, %%2. This fix allows to use %%1 var in FOR loops.case.
Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=55401
-- v7: cmd: added support of for loop's rare var names (%%1), fixed expansion of outer var loop name inside inner loop cmd: added test for rare for loop vars