patch 7.4.1864

Problem:    Python: encoding error with Python 2.
Solution:   Use "getcwdu" instead of "getcwd". (Ken Takata)

src/version.c

@@ -753,6 +753,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1864,
 /**/
     1863,
 /**/