vmod: remove support for direct vmod -> real mod mapping The current code supports statements such as: virtual_modifiers NumLock = Mod2; This would set the mapping from the NumLock vmod to the Mod2 real mod directly, without going through the virtualModifier field in an interpret statement (in xkb_compat) or vmods field in a key statement (in xkb_symbols). This is undocumented, unused and complicates things, so remove it. Signed-off-by: Ran Benita <ran234@gmail.com>