patch 8.2.4512: the find_tags_in_file() function is much too long

Problem:    The find_tags_in_file() function is much too long.
Solution:   Refactor into multiple smaller functions. (Yegappan Lakshmanan,
            closes #9892)
diff --git a/src/version.c b/src/version.c
index 6e337b4..e808010 100644
--- a/src/version.c
+++ b/src/version.c
@@ -755,6 +755,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    4512,
+/**/
     4511,
 /**/
     4510,