bug#23659: 25.0.94; insert-file-contents with REPLACE gets confused by certain file contents

[Eli Zaretskii]

> Date: Mon, 30 May 2016 20:11:16 -0400
> From: Noam Postavsky <npostavs@users.sourceforge.net>
> 
> Download all attached files into the same directory, then run
> 
>     emacs -Q -l test-insert-file-contents.el
> 
> The expected result is the text of "src" in "*a buffer*". The actual
> result has the last line ending in "_SRE" instead of "_SRC".

Repeat after me:

  Buffer text is not a simple C 'char' array
  Buffer text is not a simple C 'char' array
  Buffer text is not a simple C 'char' array
  Buffer text is not ...

Fixed on the master branch.