patch 8.1.2022: the option.c file is too big

Problem:    The option.c file is too big.
Solution:   Move option definitions to a separate file. (Yegappan Lakshmanan,
            closes #4918)
diff --git a/src/version.c b/src/version.c
index 7ac3920..e5070c6 100644
--- a/src/version.c
+++ b/src/version.c
@@ -758,6 +758,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2022,
+/**/
     2021,
 /**/
     2020,