updated for version 7.4.231
Problem:    An error in ":options" is not caught by the tests.
Solution:   Add a test for ":options".  Set $VIMRUNTIME for the tests so that
            it uses the current runtime files instead of the installed ones.
diff --git a/src/testdir/Make_dos.mak b/src/testdir/Make_dos.mak
index 45b74b4..8f749b0 100644
--- a/src/testdir/Make_dos.mak
+++ b/src/testdir/Make_dos.mak
@@ -34,7 +34,8 @@
 		test89.out test90.out test91.out test92.out test93.out \
 		test94.out test95.out test96.out test98.out test99.out \
 		test100.out test101.out test102.out test103.out test104.out \
-		test105.out test106.out
+		test105.out test106.out \
+		test_options.out
 
 SCRIPTS32 =	test50.out test70.out