Add alternative signee to GPL licenses

Author: szepeviktor

src/GPL-1.0-only.xml

@@ -354,7 +354,7 @@
         to make passes at assemblers) written by James Hacker.
       </p>
       <p>
-        &lt;signature of Ty Coon&gt;, 1 April 1989 Ty Coon, President of Vice
+        &lt;signature of <alt match="Ty Coon|Moe Ghoul" name="sample-signee">Ty Coon</alt>&gt;, 1 April 1989 <alt match="Ty Coon|Moe Ghoul" name="sample-signee">Ty Coon</alt>, President of Vice
       </p>
       <p>
         That's all there is to it!