Re: [PATCH] test-lib: guard against being run as 'prove t*.sh'

Ævar Arnfjörð Bjarmason  [off-list ref] writes:

We have t/Makefile targets to properly run the tests with prove,
however it's also just as valid to run them as e.g.:

    prove t[0-9]*.sh

But if they're run as:

    prove t*.sh

I am not sure if the above is a good enough excuse to diverge from
our convention not to add #! to signal that a scriptlet is not to
be used standalone but is meant to be dot-sourced.  At least to me,
this change looks like making the codebase worse to protect from a
mistake that we should not have to worry about in real life.

But that may be because my use of prove is limited to a more
targetted and narrow set of tests (i.e. either use "t4???-*.sh" for
an area, or a single test---anything broader I'd use "make").