patch 8.1.1090: MS-Windows: modify_fname() has problems with some 'encoding'

Problem:    MS-Windows: modify_fname() has problems with some 'encoding'.
Solution:   Use GetLongPathNameW() instead of GetLongPathName(). (Ken Takata,
            closes #4007)

src/version.c

@@ -775,6 +775,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1090,
 /**/
     1089,
 /**/