[m-dev.] Mmake unnecessary recompilation bug

[Fergus Henderson]

As a result of Simon's recent changes, *.o now depends on *.mh.

The .mh files get regenerated at every compilation, and since we don't
have .mhdate files, this forces *.o to get rebuilt every time you run
Mmake, even if the .mh files haven't changed.

I suppose the simplest fix would be to add .mhdate files.

(In the mean time, a work-around is to do
`mmake cs; touch 01010101 *.mh; mmake'.)

-- 
Fergus Henderson <fjh at cs.mu.oz.au>  |  "I have always known that the pursuit
The University of Melbourne         |  of excellence is a lethal habit"
WWW: <http://www.cs.mu.oz.au/~fjh>  |     -- the last words of T. S. Garp.
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