patch 8.2.1792: Configure does not recognize Racket 6.1+

Problem:    Configure does not recognize Racket 6.1+.
Solution:   Add a check for "rktio". (closes #7062)
diff --git a/src/version.c b/src/version.c
index 40a5ea8..33d39bd 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1792,
+/**/
     1791,
 /**/
     1790,