Revert "Test for dangling rules in make checkbuild"

This reverts commit 7709a057706b478c9687f1facaca115cb61cb169.

Reason for revert: Broke mac checkbuilds

Change-Id: If71ec9198ca8943d90ce9d5e3a277faf239e38a5
diff --git a/ui/build/build.go b/ui/build/build.go
index 78eb6a3..0df22b3 100644
--- a/ui/build/build.go
+++ b/ui/build/build.go
@@ -68,7 +68,6 @@
 	BuildSoong         = 1 << iota
 	BuildKati          = 1 << iota
 	BuildNinja         = 1 << iota
-	RunBuildTests      = 1 << iota
 	BuildAll           = BuildProductConfig | BuildSoong | BuildKati | BuildNinja
 )
 
@@ -173,18 +172,14 @@
 		}
 	}
 
-	// Write combined ninja file
-	createCombinedBuildNinjaFile(ctx, config)
-
-	if what&RunBuildTests != 0 {
-		testForDanglingRules(ctx, config)
-	}
-
 	if what&BuildNinja != 0 {
 		if !config.SkipMake() {
 			installCleanIfNecessary(ctx, config)
 		}
 
+		// Write combined ninja file
+		createCombinedBuildNinjaFile(ctx, config)
+
 		// Run ninja
 		runNinja(ctx, config)
 	}