Add missing LGPL headers

lib/dnssd.h

@@ -1,3 +1,17 @@
+/**
+ *  Copyright (C) 2012  Juho Vähä-Herttua
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Lesser General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2.1 of the License, or (at your option) any later version.
+ *
+ *  This library is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *  Lesser General Public License for more details.
+ */
+
 #ifndef DNSSD_H
 #define DNSSD_H
 
@@ -36,4 +50,4 @@ DNSSD_API void dnssd_destroy(dnssd_t *dnssd);
 #ifdef __cplusplus
 }
 #endif
-#endif
+#endif