[RFC] Add gdb remote protocol backend to strace

[Aaron Merey]

Hello,

I'm interested in updating the patch that adds a gdb remote protocol backend
(https://lists.strace.io/pipermail/strace-devel/2020-December/010284.html)
in order to prepare it for merging.

As it stands we need to rebase the patch on top of the current master branch,
fix any whitespace/formatting issues and split the patch into chunks which all
pass the testsuite.

Any suggestions on how to best split up the patch so that it's easier to
review? Are there any particular ways of organizing these changes that you are
looking for?

Thanks,
Aaron Merey