Patch to src/move-if-change

[Ben Elliston]

I've imported the new version of move-if-change from the Autoconf CVS repository:

2005-09-07  Ben Elliston  <bje@au.ibm.com>

        Import from Autoconf sources:

        2005-09-06  Paul Eggert  <eggert@cs.ucla.edu>
        * move-if-change: Don't output "$2 is unchanged"; suggested
        by Ben Elliston.  Handle weird characters correctly.

Cheers, Ben
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