g_autoptr() is a macro that was defined in GLib 2.44 that allows for
basic auto-cleanup of variables. One way to add this kind of support
would be through the use of e.g. `G_DECLARE_DERIVABLE_TYPE()` for our
declarations, but this would consitute an ABI break (due to the
`...Private *` field in the public structs). Instead, we can use
`G_DEFINE_AUTOPTR_CLEANUP_FUNC` to manually declare this.
This commit also bumps the minimally required GLib version to 2.44
* This is necessary because sometimes we don't want to complain,
for expected errors, when running nested operations.
* The fact that we have to do this is silly, and soon there
will be a solution in glib itself.
https://bugzilla.gnome.org/show_bug.cgi?id=688165
* If the default keyring does not exist when storing a secret
try and create it.
* We handle both secrets that correctly return NoSuchObject
and ones that just return the silly DBus UnknownMethod error.
https://bugzilla.gnome.org/show_bug.cgi?id=688165
* C callers need to use libsecret-0 pkg-config file for stable and
libsecret-unstable for unstable stuff.
* Vala callers need to '--pkg libsecret-unstable' for unstable
* GObject Introspection callers need to use the SecretUnstable package
* Death by a thousand paper cuts from gir and vapi not liking
the fact that the secret.h file was not usable uninstalled
and installed in the same way.
