Free the corresponding memory when the library is unloaded.

riched20: RTF{G,S}et{In,Out}putName() are unused so remove them as well as the corresponding _RTF_Info fields.

Now the function deals with all errors and win_skips() itself.

This isn't completely right, since as far as I'm aware SM4 doesn't have shader
limits in the same sense as previous shader models, but this should do for now.