w_set_winver: use winecfg to set the windows version for wine >=5.7
w_set_winver: use winecfg to set the windows version for wine >=5.7

Note: most of the change is whitespace, use `git show -w` to see the
'real' diff

Tested with:
{win32/64}-{mingw,no-mingw}-{5.0,5.9}

Winetricks/winetricks,Winetricks/winetricks