thekla_atlas: Fix compilation error

Bug introduced in 65fb961b8b2c81ce33c9e0e4c0add7b13da0193a.

thirdparty/thekla_atlas/nvmesh/param/Atlas.h

@@ -64,7 +64,7 @@ namespace nv
 
         // Pack charts in the smallest possible rectangle.
         float packCharts(int quality, float texelArea, bool blockAlign, bool conservative);
-        bool setFailed() { failed = true; }
+        void setFailed() { failed = true; }
         bool hasFailed() const { return failed; }
 
     private: