[emacs-w3m:13378] [emacs-w3m/emacs-w3m] Fix: w3m-insert-string modifies string (#36)

encode-coding-string may modify unibyte string.

```lisp
(let ((string (string-to-unibyte "\300\261")))
  (encode-coding-string string 'utf-8-emacs))

-> "\261"
```
You can view, comment on, or merge this pull request online at:

  https://github.com/emacs-w3m/emacs-w3m/pull/36

-- Commit Summary --

  * * w3m-util.el (w3m-insert-string): Don't touch unibyte string.

-- File Changes --

    M ChangeLog (5)
    M w3m-util.el (7)

-- Patch Links --

https://github.com/emacs-w3m/emacs-w3m/pull/36.patch
https://github.com/emacs-w3m/emacs-w3m/pull/36.diff

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