DOCS: Add URLs to all referred-to licenses in AUTHORS

[ci skip]

AUTHORS

@@ -109,22 +109,22 @@ tolua++
    scripts from The Witcher. To minimize dependencies on "uncommon" libraries,
    xoreos completely includes the toluapp 1.0.92 library code. tolua++ is
    licensed under the terms of the MIT license. For the full license text,
-   see toluapp/COPYRIGHT.
+   see toluapp/COPYRIGHT or <https://opensource.org/licenses/MIT>.
 
 UTF-8 CPP
 *********
    xoreos uses the lightweight header-only UTF-8 CPP library
    (<http://utfcpp.sourceforge.net/>) for handling UTF-8 encoded strings.
    UTF-8 CPP is licensed under the Boost Software License. See utf8cpp/utf8.h
-   for details.
+   or <https://www.boost.org/users/license.html> for details.
 
 GLM
 ***
    xoreos uses the header-only C++ mathematics library for graphics software
    OpenGL Mathematics (GLM) (<https://glm.g-truc.net/>), completely including
    the GLM headers. GLM can be distributed and/or modified under the terms of
    either a) The Happy Bunny License, or b) the MIT License. For the full
-   license text, see glm/copying.txt.
+   license text, see glm/copying.txt or <https://glm.g-truc.net/copying.txt>.
 
 ScummVM code
 ************