":set all&" might change &encoding without reexecuting "mb_init()", if encoding 
was changed earlier from the locale default, leaving multibyte handling in 
inconsistent state.

To reproduce (assuming utf-8 locale):
vim -u NONE --cmd "set enc=latin1"

Inside vim, type ":set all&", now ":set enc" shows "utf-8", but vim still 
behaves as if enc=latin1, and by running inside gdb and "break mb_init", it is 
confirmed that mb_init wasn't reexecuted.

Earlier discussion: 
https://github.com/neovim/neovim/pull/2929#issuecomment-128849173

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