[m-rev.] For review: fix a compiler abort

[Ralph Becket]

Ralph Becket, Wednesday, 28 November 2007:
> Estimated hours taken: 8
> Branches: main
> 
> Fix a bug where the compiler was throwing an exception trying to print out some
> error messages where the builtin module qualifier had been stripped from the
> sym_names.
> 
> compiler/mode_util.m:
> 	In mode_get_insts_semidet/4, if a user-defined mode name is
> 	unqualified and the lookup fails, qualify the name with
> 	the mercury_public_builtin_module and try again.

I should further explain that simply
- not stripping the builtin qualifiers and
- not printing builtin qualifiers
doesn't work because the .int files expect fully qualified names.
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