CMake: restore WITH_DRACO, WITH_PYTHON_INSTALL dependency

This was removed in [0] but is only valid when building as a Python
module.

[0]: a0f653c002

CMakeLists.txt

@@ -1231,6 +1231,13 @@ set_and_warn_dependency(WITH_PYTHON WITH_CYCLES        OFF)
 set_and_warn_dependency(WITH_PYTHON WITH_DRACO         OFF)
 set_and_warn_dependency(WITH_PYTHON WITH_MOD_FLUID     OFF)
 
+if(NOT WITH_PYTHON_MODULE)
+  if(WITH_DRACO AND NOT WITH_PYTHON_INSTALL)
+    message(STATUS "WITH_DRACO requires WITH_PYTHON_INSTALL to be ON, disabling WITH_DRACO for now")
+    set(WITH_DRACO OFF)
+  endif()
+endif()
+
 # enable boost for cycles, audaspace or i18n
 # otherwise if the user disabled