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/Filelist b/Filelist
index bf752c5..304ddb0 100644
--- a/Filelist
+++ b/Filelist
@@ -198,7 +198,6 @@
 		src/testdir/view_util.vim \
 		src/testdir/test[0-9]*.ok \
 		src/testdir/test77a.ok \
-		src/testdir/test83-tags? \
 		src/testdir/test77a.com \
 		src/testdir/test_*.vim \
 		src/testdir/python2/*.py \
@@ -1000,6 +999,7 @@
 		runtime/doc/*-tr.1 \
 		runtime/doc/*-tr.UTF-8.1 \
 		runtime/lang/README.txt \
+		runtime/lang/Makefile \
 		runtime/lang/menu_*.vim \
 		runtime/keymap/README.txt \
 		runtime/keymap/*.vim \