Fix build break on mac

am: 756d558a

Change-Id: I5fc1c8f5b496a8978dfaff051a927c13f301bae0

host/commands/emugen/Android.bp

@@ -9,5 +9,4 @@ cc_binary_host {
         "TypeFactory.cpp",
     ],
     cflags: ["-Wno-unused-parameter"],
-    defaults: ["cuttlefish_host_only"],
 }