[m-dev.] move to // comments in C

[Zoltan Somogyi]

As I was cleaning up the runtime, I noticed that it had one // style
comment, in mercury_stack_trace.c, which has been there since 2012.
Since noone has reported any problems with it, I propose that we
change our official programming style for C code to prefer // comments
over /* */ comments.

Zoltan.
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