use PyImport_ExtendInittab for py module initialization rather then adding to sys.modules directly, no functional change.

source/blender/python/intern/bpy.c

@@ -195,12 +195,7 @@ void BPy_init_modules( void )
 		printf("bpy: couldnt find 'scripts/modules', blender probably wont start.\n");
 	}
 	/* stand alone utility modules not related to blender directly */
-	Mathutils_Init();
-	Noise_Init();
-	BGL_Init();
-	BLF_Init();
-	IDProp_Init_Types();
-	AUD_initPython();
+	IDProp_Init_Types(); /* not actually a submodule, just types */
 
 	mod = PyModule_New("_bpy");
 

source/blender/python/intern/bpy_interface.c

@@ -196,6 +196,22 @@ void BPY_set_context(bContext *C)
 	BPy_SetContext(C);
 }
 
+/* init-tab */
+extern PyObject *BPyInit_noise(void);
+extern PyObject *BPyInit_mathutils(void);
+extern PyObject *BPyInit_bgl(void);
+extern PyObject *BPyInit_blf(void);
+extern PyObject *AUD_initPython(void);
+
+static struct _inittab bpy_internal_modules[]= {
+	{"noise", BPyInit_noise},
+	{"mathutils", BPyInit_mathutils},
+	{"bgl", BPyInit_bgl},
+	{"blf", BPyInit_blf},
+	{"aud", AUD_initPython},
+	{NULL, NULL}
+};
+
 /* call BPY_set_context first */
 void BPY_start_python( int argc, char **argv )
 {
@@ -206,6 +222,9 @@ void BPY_start_python( int argc, char **argv )
 	utf8towchar(bprogname_wchar, bprogname);
 	Py_SetProgramName(bprogname_wchar);
 
+	/* builtin modules */
+	PyImport_ExtendInittab(bpy_internal_modules);
+
 	BPY_start_python_path(); /* allow to use our own included python */
 
 	Py_Initialize(  );

source/blender/python/intern/bpy_operator.c

@@ -313,14 +313,8 @@ static struct PyModuleDef bpy_ops_module = {
 PyObject *BPY_operator_module(void)
 {
 	PyObject *submodule;
-	
-	submodule= PyModule_Create(&bpy_ops_module);
-	PyDict_SetItemString(PyImport_GetModuleDict(), bpy_ops_module.m_name, submodule);
 
-	/* INCREF since its its assumed that all these functions return the
-	 * module with a new ref like PyDict_New, since they are passed to
-	  * PyModule_AddObject which steals a ref */
-	Py_INCREF(submodule);
+	submodule= PyModule_Create(&bpy_ops_module);
 
 	return submodule;
 }