patch 9.1.0859: several problems with the GLVS plugin

Problem:  several problems with the GLVS plugin
Solution: fix issues, add regression tests, require at least Vim 9.1
          (GuyBrush)

closes: #16036

Signed-off-by: GuyBrush <miguel.barro@live.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/testdir/Make_all.mak b/src/testdir/Make_all.mak
index 6a7f4d3..bdf058c 100644
--- a/src/testdir/Make_all.mak
+++ b/src/testdir/Make_all.mak
@@ -173,6 +173,7 @@
 	test_gf \
 	test_glob2regpat \
 	test_global \
+	test_glvs \
 	test_gn \
 	test_goto \
 	test_gui \
@@ -437,6 +438,7 @@
 	test_gettext_make.res \
 	test_getvar.res \
 	test_gf.res \
+	test_glvs.res \
 	test_gn.res \
 	test_goto.res \
 	test_gui.res \