[PATCH 2/2] test: replace use of gdb with LD_PRELOAD shims in T070-insert.sh

[Ralph Seichter]

* Daniel Kahn Gillmor:

> Do you think we could go ahead and apply these patches on master now
> anyway, and fix them up subsequently to make sure they apply to MacOS?

I still have not been able to set up any macOS based tests, because
contractual work has kept me busy. I suggest you go ahead with the
changes, and should I run into any unexpected issues in future builds,
I'll speak up. I don't want to slow you folks down.

-Ralph