Fix T46090: Blender game embedded player crash

SCons didn't pass `-DWITH_AUDASPACE` to the compiler, so it skipped the
instantiation of the "aud" Python module. This caused a crash of the BGE,
which did get the `-DWITH_AUDASPACE` directive, and expected that module
to exist.

Reviewed by: lukastoenne

source/blender/python/SConscript

@@ -93,8 +93,8 @@ if env['WITH_BF_PYTHON_SAFETY']:
 if env['BF_BUILDINFO']:
     defs.append('BUILD_DATE')
 
-
-# Audaspace is always on currently
+if env['WITH_BF_AUDASPACE']:
+    defs += env['BF_AUDASPACE_DEF']
 
 if env['WITH_BF_BULLET']:
     defs.append('WITH_BULLET')