Revert "Remove RTLD_GLOBAL flag from apps. (#2312)"

This reverts commit d890c64.

examples/motion_viewer.py

@@ -2,10 +2,15 @@
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
 
+import ctypes
 import random
+import sys
 import time
 from typing import Any, Callable, Dict, Optional, Tuple
 
+flags = sys.getdlopenflags()
+sys.setdlopenflags(flags | ctypes.RTLD_GLOBAL)
+
 import magnum as mn
 from magnum.platform.glfw import Application
 from viewer import HabitatSimInteractiveViewer, MouseMode, Timer

examples/viewer.py

@@ -2,13 +2,18 @@
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
 
+import ctypes
 import math
 import os
 import string
+import sys
 import time
 from enum import Enum
 from typing import Any, Callable, Dict, List, Optional, Tuple
 
+flags = sys.getdlopenflags()
+sys.setdlopenflags(flags | ctypes.RTLD_GLOBAL)
+
 import magnum as mn
 import numpy as np
 from magnum import shaders, text

src_python/habitat_sim/__init__.py

@@ -6,12 +6,6 @@
 
 import builtins
 
-# Important platform-specific setup steps to do before using bindings.
-try:
-    import magnum
-except ImportError:
-    pass
-
 __version__ = "0.3.1"
 
 if not getattr(builtins, "__HSIM_SETUP__", False):