[m-rev.] for review: avoid misleading error message

[Julien Fischer]

On Wed, 9 Feb 2022, Zoltan Somogyi wrote:

>
> 2022-02-09 12:20 GMT+11:00 "Julien Fischer" <jfischer at opturion.com>:
>>> -[Mercury compiler not yet installed -
>>> +[$MC_UNAVAIL_MSG compiler not yet installed -
>>
>> Delete the words "compiler not yet installed" there.
>
> Done.
>
>>>  ****    cannot use grade '$BEST_GRADE_FOR_COMPILER'
>>>  ****    using grade '$GRADE' to compile the compiler
>>>  ****    after installation is complete you may reinstall
>
> I also converted this part to use sentences.
>
>> The rest looks fine.
>
> Thanks. The diff is committed.

Thanks, I will do some further testing and merge on to the release
branch if all is well.

Julien.