patch 8.0.0368: not all options are tested with a range of values

Problem:    Not all options are tested with a range of values.
Solution:   Generate a test script from the source code.
diff --git a/Filelist b/Filelist
index 316a403..99f72d0 100644
--- a/Filelist
+++ b/Filelist
@@ -97,6 +97,7 @@
 		src/tee/tee.c \
 		src/xxd/xxd.c \
 		src/main.aap \
+		src/gen_opt_test.vim \
 		src/testdir/main.aap \
 		src/testdir/README.txt \
 		src/testdir/Make_all.mak \