code cleanup: add 'const' to headers to quiet msvc warnings, also remove (char *) casts that aren't needed now we're on Python3.3

source/blender/python/intern/bpy.c

@@ -222,7 +222,7 @@ static PyMethodDef meth_bpy_resource_path =
 
 static PyObject *bpy_import_test(const char *modname)
 {
-	PyObject *mod = PyImport_ImportModuleLevel((char *)modname, NULL, NULL, NULL, 0);
+	PyObject *mod = PyImport_ImportModuleLevel(modname, NULL, NULL, NULL, 0);
 	if (mod) {
 		Py_DECREF(mod);
 	}