patch 8.1.0152: cannot easily run individual tests on MS-Windows

Problem:    Cannot easily run individual tests on MS-Windows.
Solution:   Move the list of tests to a separate file.  Add a build rule in
            the MSVC makefile.
diff --git a/Filelist b/Filelist
index 07df299..5695a38 100644
--- a/Filelist
+++ b/Filelist
@@ -7,6 +7,7 @@
 		.lgtm.yml \
 		.travis.yml \
 		appveyor.yml \
+		src/Make_all.mak \
 		src/appveyor.bat \
 		src/README.txt \
 		src/alloc.h \