[m-dev.] Update library pragma C code

[Fergus Henderson]

On 04-Aug-1998, Peter Schachte <pets at students.cs.mu.oz.au> wrote:
> On Mon, 3 Aug 1998, Fergus Henderson wrote:
> 
> > These and all the others in math.m are missing `will_not_call_mercury'.
> 
> I rest my case.

As Tom pointed out, when the code in math.m was written,
`will_not_call_mercury' was the default (and in fact I think
that is still the case; Tom is making these changes in preparation
for changing the default).  So that is not a convincing example.

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