More const/static-ification

Common/VR/VRMath.cpp

@@ -13,10 +13,10 @@ float ToRadians(float deg) {
 	return (float)(deg * M_PI / 180.0f);
 }
 
-bool IsMatrixIdentity(float* matrix) {
+bool IsMatrixIdentity(const float *matrix4x4) {
 	for (int i = 0; i < 4; i++) {
 		for (int j = 0; j < 4; j++) {
-			float value = matrix[i * 4 + j];
+			float value = matrix4x4[i * 4 + j];
 
 			// Other number than zero on non-diagonale
 			if ((i != j) && (fabs(value) > EPSILON)) return false;