Consider GCC-exception-2.0 aka Linking exception as REQUIRE_CITATION

The exception reads as follows:

```
            LINKING EXCEPTION

 In addition to the permissions in the GNU General Public License,
 the authors give you unlimited permission to link the compiled
 version of this library into combinations with other programs,
 and to distribute those combinations without any restriction
 coming from the use of this file.  (The General Public License
 restrictions do apply in other respects; for example, they cover
 modification of the file, and distribution when not linked into
 a combined executable.)
```

If one does not copy these source code randomly, we can classify this license as REQUIRE_CITATION.

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