patch 8.2.3929: using unititialized variable

Problem:    Using unititialized variable.
Solution:   Set the option flags to zero for a terminal option.

src/option.c

@@ -3962,6 +3962,9 @@ get_option_value(
 	    char_u key_name[2];
 	    char_u *p;
 
+	    if (flagsp != NULL)
+		*flagsp = 0;  // terminal option has no flags
+
 	    // check for a terminal option
 	    if (key < 0)
 	    {

src/version.c

@@ -749,6 +749,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    3929,
 /**/
     3928,
 /**/