patch 8.2.4975: recursive command line loop may cause a crash

Problem:    Recursive command line loop may cause a crash.
Solution:   Limit recursion of getcmdline().
diff --git a/src/version.c b/src/version.c
index 98bb40d..8d901e4 100644
--- a/src/version.c
+++ b/src/version.c
@@ -747,6 +747,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    4975,
+/**/
     4974,
 /**/
     4973,