patch 8.1.1180: Vim script debugger tests are old style

Problem:    Vim script debugger tests are old style.
Solution:   Turn into new style tests. (Yegappan Lakshmanan, closes #4259)
diff --git a/src/Makefile b/src/Makefile
index 116f494..bee20ae 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -2176,7 +2176,7 @@
 	test64 test69 \
 	test70 test72 \
 	test86 test87 test88 \
-	test94 test95 test99 test108:
+	test94 test95 test99:
 	cd testdir; rm -f $@.out; $(MAKE) -f Makefile $@.out VIMPROG=../$(VIMTESTTARGET) $(GUI_TESTARG) SCRIPTSOURCE=../$(SCRIPTSOURCE)
 
 # Run individual NEW style test.