* License libsecret under LGPL2.1+. We can do this because the
files that make up the library are either LGPL2.0+ or LGPL2.1+
* Correctly include a file which contains the full texts of the
various licenses used in the tests.
* Include license headers in some files that contained no license
headers.
https://bugzilla.gnome.org/show_bug.cgi?id=680781
