tests: remove test for strcasecmp

process: don't try to close the status

README: replace gmaster with GitButler

`process->status` is a status value; we were mistakenly trying to close
it as a file descriptor, as if it were the `status` self-pipe that we open
during process creation.

Instead, don't try to close it, as it's not a file descriptor.

master is no more; GitButler is a new client using libgit2.

Fixes #6689

It was unused and only defined in posix.h
It did not exist in its Windows equivalent.

strcasecmp is a posix function, testing it doesn't make sense.
Functions that needs unsigned compare should use git__strcasecmp()

cli: add `index-pack` command

ci: allow workflows to push changes

Our workflows push documentation changes; ensure that they are allowed
to do so.

Fix 'path cannot exist in repository' during diff for in-memory repository

ci: allow workflows to read and write packages

Git blame buffer gives the wrong result in many cases where there are…

cmake: rename FindIconv to avoid collision with cmake

Our CI workflows consume and will automatically generate their build
containers. Ensure that they can do so.

cmake now includes `FindIconv`. Rename ours to avoid any confusion.

actions: set permissions

Several compatibility fixes

We now allow leading and trailing dots in username and email addresses.
Test that we do so.

clone: don't mix up "http://url" with "http:/url" when figuring out if we should do a local clone

process: test /usr/bin/false on BSDs

Support setting oid type for in-memory repositories

Pass a pointer to the quote counts so that we can increment it.

Ensure that we declare variables at the top of the block for broad
compatibility with old compilers.

push: set generic error in push_negotiation cb

release: add a compatibility label

Add a compatibility label to the release.yml to describe things that are for improved cross-platform compatibility.