add set_opt.bat for test on Windows
diff --git a/test/set_opt.bat b/test/set_opt.bat
new file mode 100644
index 0000000..836d059
--- /dev/null
+++ b/test/set_opt.bat
@@ -0,0 +1,2 @@
+@echo off
+set OPT=/EHsc -I../xbyak /W4 -D_CRT_SECURE_NO_WARNINGS /nologo
\ No newline at end of file