[m-rev.] Refactoring make_temp

[Sebastian Godelet]

Hi Paul,


>From an initial screening I think you preserved all the additions I made, but I've yet to build this.

Couple of things though:

In line 10935 (https://github.com/Mercury-Language/mercury/compare/master...PaulBone:make_temp#diff-c8358543868f79aa0b536505b8138fbaR10935) you comment out a huge bunch of code,
I'd rather rely on version management instead (so git blame and stuff continue to work); also I think io.m is already large enough.

In line 11226, you changed have_make_temp_directory to always return MR_TRUE, maybe we should get rid off the procedure altogether (if I remember that was a new, so unreleased, addition).
I'll try to build this changes later

Sebastian.

P.S: I hope I didn't send emails twice or more times my Outlook was giving up on me.