[m-rev.] for review: port Mercury to MacOS X 10.6

[Ian MacLarty]

I've been testing this change on saturn and my change to
mercury_event_scanner.l is causing problems.  The problem is that on
saturn flex is generating

int mercury_event_get_leng (void );

and on Mac OS it's generating:

yy_size_t mercury_event_get_leng (void );

even though they are both using exactly the same version of flex (2.5.35).

The comments above the declaration of mercury_event_get_leng in
mercury_event_scanner.l say:

** Add the declarations for local functions that flex is too lazy to add.

however flex 2.5.35 *is* generating declarations for these functions
in mercury_event_scanner.c.

Shall I remove the declaration in mercury_event_scanner.l or can
someone suggest an alternative fix?

Ian.
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