License headers: "GLib" -> "This library"
Harmonize a little the license headers. In most of the license headers in GLib, it is "This library". It is also what is explained at: https://www.gnu.org/licenses/old-licenses/lgpl-2.1.html#SEC4 "How to Apply These Terms to Your New Libraries" https://bugzilla.gnome.org/show_bug.cgi?id=776586
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