[m-rev.] Tiny change to fix building

[Ben Schmidt]

> How exactly is it breaking the build process?

It reveals a GCC bug. When compiling mercury_event_parser.c it fails, 
grumbling about differing types for YYSTYPE, though they are defined to 
be exactly the same union (once in the included header file and once in 
the .c file proper).

Ben.



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