[m-dev.] Regression test change

[Fergus Henderson]

Bert THOMPSON, you wrote:
> 
> Estimated hours taken: 0.1
> 
> Some of the makefiles contain calls to "diff -u", however the 
> -u option is not supported on most platforms, whereas the -c option is. 
> The -c option has almost exactly the same effect.

That change is fine, except that the log message should be more
specific about which platforms support `diff -c' but not `diff -u'
(name at least one of them).

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