Fix T31555: Username with special chars in Windows 7

At last! Could not check seriously on windows (though it was done during py patch
process).

source/blender/python/intern/bpy_interface.c

@@ -257,11 +257,7 @@ void BPY_python_start(int argc, const char **argv)
 	 * an error, this is highly annoying, another stumbling block for devs,
 	 * so use a more relaxed error handler and enforce utf-8 since the rest of
 	 * blender is utf-8 too - campbell */
-
-	/* XXX, update: this is unreliable! 'PYTHONIOENCODING' is ignored in MS-Windows
-	 * when dynamically linked, see: [#31555] for details.
-	 * Python doesn't expose a good way to set this. */
-	BLI_setenv("PYTHONIOENCODING", "utf-8:surrogateescape");
+	Py_SetStandardStreamEncoding("utf-8", "surrogateescape");
 
 	/* Update, Py3.3 resolves attempting to parse non-existing header */
 #if 0