patch 8.2.3917: the eval.txt help file is way too big

Problem:    The eval.txt help file is way too big.
Solution:   Move the builtin function details to a separate file.
diff --git a/src/version.c b/src/version.c
index 944b1f6..1a71a53 100644
--- a/src/version.c
+++ b/src/version.c
@@ -750,6 +750,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    3917,
+/**/
     3916,
 /**/
     3915,