Add numeric index to Buildkite name on Windows.
diff --git a/buildkite/startup-windows.ps1 b/buildkite/startup-windows.ps1
index e21a567..3f4d61c 100755
--- a/buildkite/startup-windows.ps1
+++ b/buildkite/startup-windows.ps1
@@ -52,7 +52,7 @@
 $buildkite_agent_root = "c:\buildkite"

 $buildkite_agent_config = @"

 token="${buildkite_agent_token}"

-name="%hostname"

+name="%hostname-%n"

 tags="os=windows"

 build-path="d:\build"

 hooks-path="c:\buildkite\hooks"