patch 8.2.0358: insufficient testing for indent.c

Problem:    Insufficient testing for indent.c.
Solution:   Add indent tests. (Yegappan Lakshmanan, closes #5736)
diff --git a/src/testdir/Make_all.mak b/src/testdir/Make_all.mak
index fab8656..f4ba55d 100644
--- a/src/testdir/Make_all.mak
+++ b/src/testdir/Make_all.mak
@@ -146,6 +146,7 @@
 	test_iminsert \
 	test_increment \
 	test_increment_dbcs \
+	test_indent \
 	test_ins_complete \
 	test_interrupt \
 	test_job_fails \
@@ -376,6 +377,7 @@
 	test_iminsert.res \
 	test_increment.res \
 	test_increment_dbcs.res \
+	test_indent.res \
 	test_ins_complete.res \
 	test_interrupt.res \
 	test_job_fails.res \