Also exclude the IK sample when the URHO3D_IK option is disabled.

Source/Samples/45_InverseKinematics/CMakeLists.txt

@@ -20,6 +20,10 @@
 # THE SOFTWARE.
 #
 
+if (NOT URHO3D_IK OR NOT URHO3D_PHYSICS)
+    return ()
+endif ()
+
 # Define target name
 set (TARGET_NAME 45_InverseKinematics)