Fix a warning in libtess in Release builds; define NDEBUG in Release on all
platforms.

BUG:  http://code.google.com/p/skia/issues/detail?id=456
Review URL:  http://codereview.appspot.com/5555054/



git-svn-id: http://skia.googlecode.com/svn/trunk/third_party/glu@3076 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/gluos.h b/gluos.h
index 5da46a5..e94c679 100644
--- a/gluos.h
+++ b/gluos.h
@@ -71,7 +71,9 @@
 #define __gl_edgeSign Sk__gl_edgeSign
 #define __gl_memInit Sk__gl_memInit
 #define __gl_meshAddEdgeVertex Sk__gl_meshAddEdgeVertex
+#ifndef NDEBUG
 #define __gl_meshCheckMesh Sk__gl_meshCheckMesh
+#endif
 #define __gl_meshConnect Sk__gl_meshConnect
 #define __gl_meshDelete Sk__gl_meshDelete
 #define __gl_meshDeleteMesh Sk__gl_meshDeleteMesh