Set modes and run appropriate hooks when visiting a file via magic

Set modes and run appropriate hooks when visiting a file via magic

This little change makes a big difference and now it should be quite
safe to add `(magic:find-file-magic-files-alist)' into your init.el.

	* lisp/ffi/ffi-magic.el (magic:find-file-noselect):
	  Call #'after-find-file to ensure modes and hooks are done
	  right.

Signed-off-by: Steve Youngs <steve@sxemacs.org>