[m-dev.] Regression test change

[Bert Thompson]

|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).

Good idea. Updated log message below.

--------------------

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.

These platforms have the -c option but not the -u option:
	Digital Unix
	Solaris
	SunOS
	POSIX

These platforms has both -c and -u options:
	IRIX
	Linux (GNU diff)

tests/
	Mmake.common
	warnings/Mmake
	invalid/Mmake

Changed "diff -u" to "diff -c".

CVS: ----------------------------------------------------------------------