patch 8.0.1364: there is no easy way to get the window position

Problem:    There is no easy way to get the window position.
Solution:   Add win_screenpos().
diff --git a/src/version.c b/src/version.c
index 8587b4d..e85058e 100644
--- a/src/version.c
+++ b/src/version.c
@@ -772,6 +772,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1364,
+/**/
     1363,
 /**/
     1362,