Use the new Unicode API

 * Replace PyUnicode_FromUnicode(NULL, 0) by PyUnicode_New(0, 0)
 * Replce PyUnicode_FromUnicode(str, len) by PyUnicode_FromWideChar(str, len)
 * Replace Py_UNICODE by wchar_t
 * posix_putenv() uses PyUnicode_FromFormat() to create the string, instead
   of PyUnicode_FromUnicode() + _snwprintf()
diff --git a/PC/winsound.c b/PC/winsound.c
index 1ed95ba..b564eab 100644
--- a/PC/winsound.c
+++ b/PC/winsound.c
@@ -72,7 +72,7 @@
 static PyObject *
 sound_playsound(PyObject *s, PyObject *args)
 {
-    Py_UNICODE *wsound;
+    wchar_t *wsound;
     int flags;
     int ok;