disable Mpr on Mac OSX (need to split the kernel again...)

src/Bullet3OpenCL/NarrowphaseCollision/b3ConvexHullContact.cpp

@@ -16,7 +16,11 @@ subject to the following restrictions:
 bool findSeparatingAxisOnGpu = true;
 bool splitSearchSepAxisConcave = false;
 bool splitSearchSepAxisConvex = true;
+#ifdef __APPLE__
+bool useMprGpu = false;
+#else
 bool useMprGpu = true;//use mpr for edge-edge  (+contact point) or sat. Needs testing on main OpenCL platforms, before enabling...
+#endif
 bool bvhTraversalKernelGPU = true;
 bool findConcaveSeparatingAxisKernelGPU = true;
 bool clipConcaveFacesAndFindContactsCPU = false;//false;//true;