remove "register" keyword:

clang warns: 'register' storage class specifier is deprecated
http://stackoverflow.com/questions/10675072/is-the-register-keyword-still-used

code/GenVertexNormalsProcess.cpp

@@ -195,7 +195,7 @@ bool GenVertexNormalsProcess::GenMeshVertexNormals (aiMesh* pMesh, unsigned int
 			// Write the smoothed normal back to all affected normals
 			for (unsigned int a = 0; a < verticesFound.size(); ++a)
 			{
-				register unsigned int vidx = verticesFound[a];
+				unsigned int vidx = verticesFound[a];
 				pcNew[vidx] = pcNor;
 				abHad[vidx] = true;
 			}