patch 9.1.0546: vim-tiny fails on CTRL-X/CTRL-A

Problem:  vim-tiny fails on CTRL-X/CTRL-A
          (Rob Foehl, after 9.1.0172)
Solution: Move #ifdefs, so that after changing the line in del_bytes,
          the cached textlen value is invalidated

closes: #15178

Co-authored-by: zeertzjq <zeertzjq@outlook.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/testdir/Make_all.mak b/src/testdir/Make_all.mak
index a49f158..f199fec 100644
--- a/src/testdir/Make_all.mak
+++ b/src/testdir/Make_all.mak
@@ -20,7 +20,8 @@
 	test24 \
 	test25 \
 	test26 \
-	test27
+	test27 \
+	test28
 
 SCRIPTS_TINY_OUT = \
 	test10.out \
@@ -31,7 +32,8 @@
 	test24.out \
 	test25.out \
 	test26.out \
-	test27.out
+	test27.out \
+	test28.out
 
 # Tests for Vim9 script.
 TEST_VIM9 = \