Use style = Tag everywhere possible

See merge request redox-os/relibc!151

This undos a workaround. Jeremy moved the ralloc stuff to platform and suddenly this seems to work again. I don't know what is different from when I tried this before and now, but I don't really care

Fixing some things in stdio

See merge request redox-os/relibc!136

Actually remove stdlib from stdio. This should have been done with wchar being put in, but I messed something up

Apparently a root-level cfg does not go well with a root-level no_std