patch 8.2.1310: configure with Xcode 12 fails to check for tgetent

Problem:    Configure with Xcode 12 fails to check for tgetent.
Solution:   Declare tgetent(). (Ozaki Kiichi, closes #6558)
diff --git a/src/version.c b/src/version.c
index fb64158..d8dfba8 100644
--- a/src/version.c
+++ b/src/version.c
@@ -755,6 +755,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1310,
+/**/
     1309,
 /**/
     1308,