Rather than maintaining a list of #ifdef guards to check systems that do
not provide the reentrant version of getgrent, we can use C++ concepts
to let the compiler perform this check for us.
While we're at it, we can also provide this wrapper as fallible to let
the caller TRY calling it.
This will make it easier to support both string types at the same time
while we convert code, and tracking down remaining uses.
One big exception is Value::to_string() in LibJS, where the name is
dictated by the ToString AO.
We have a new, improved string type coming up in AK (OOM aware, no null
state), and while it's going to use UTF-8, the name UTF8String is a
mouthful - so let's free up the String name by renaming the existing
class.
Making the old one have an annoying name will hopefully also help with
quick adoption :^)
Most changes are around user and group management, which are exposed in
the Android NDK differently than other Unices.
We require version 30 for memfd_create, version 28 for posix_spawn, and
so on. It's possible a shim for memfd_create could be used, but since
Google is mandating new apps use API level 30 as of Nov 2022, this seems
suitable.
This hides the method Group::add_group() on both MacOS and OpenBSD since
the function putgrent(), which is essential for add_group() to work, is
not available on these OSes.
This adds the Core::Group C++ abstraction to ease interaction with the
group entry database, as well as represent the Group entry.
Core::Group abstraction currently contains the following functionality:
- Add a group entry - 'Core::Group::add_group()'
