patch 8.1.2045: the option.c file is too big

Problem:    The option.c file is too big.
Solution:   Split off the code dealing with strings. (Yegappan Lakshmanan,
            closes #4937)
diff --git a/src/version.c b/src/version.c
index c23fc83..34e3e6b 100644
--- a/src/version.c
+++ b/src/version.c
@@ -758,6 +758,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2045,
+/**/
     2044,
 /**/
     2043,