Merge pull request #53 from yuchenericwu2/fix_phony

bootstrap: Added phony rule for bootstrapManifest.
diff --git a/bootstrap/bootstrap.go b/bootstrap/bootstrap.go
index b157440..3cc5672 100644
--- a/bootstrap/bootstrap.go
+++ b/bootstrap/bootstrap.go
@@ -837,7 +837,7 @@
 		// cleanup
 		ctx.Build(pctx, blueprint.BuildParams{
 			Rule:    blueprint.Phony,
-			Outputs: []string{mainNinjaFile, docsFile},
+			Outputs: []string{mainNinjaFile, docsFile, "$bootstrapManifest"},
 		})
 
 		if primaryBuilderName == "minibp" {