Copyright: Document recastnavigation

COPYRIGHT.txt

@@ -315,6 +315,11 @@ Comment: PvrTcCompressor
 Copyright: 2014, Jeffrey Lim.
 License: BSD-3-clause
 
+Files: ./thirdparty/recastnavigation/
+Comment: Recast
+Copyright: 2009, Mikko Mononen
+License: Zlib
+
 Files: ./thirdparty/rtaudio/
 Comment: RtAudio
 Copyright: 2001-2016, Gary P. Scavone

thirdparty/README.md

@@ -359,11 +359,11 @@ Files extracted from upstream source:
 - all .cpp and .h files apart from `main.cpp`
 - LICENSE.TXT
 
-## recast
+## recastnavigation
 
 - Upstream: https://github.com/recastnavigation/recastnavigation
 - version: git commit ef3ea40f - 2016-02-06
-- License: MIT-like
+- License: zlib
 
 ## rtaudio