backports: Backport g_info()

The rest of the g_log() wrappers have been there since time immemorial,
but g_info() was initially omitted. It's useful for projects like Flatpak
that want to have two levels of off-by-default logging, which map nicely
to info and debug.

Signed-off-by: Simon McVittie <smcv@collabora.com>
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