Obviate libbinder_ndk_host_user.

After this, it is no longer required in order to use libbinder_ndk on
host. Following this change, all users will be cleaned up and the
module itself will be removed.

Bug: 211908498
Test: build
Change-Id: I7136472677ada11cc2c0b726cd849cac98d3ee4e
diff --git a/libs/binder/ndk/Android.bp b/libs/binder/ndk/Android.bp
index 4289574..77493b3 100644
--- a/libs/binder/ndk/Android.bp
+++ b/libs/binder/ndk/Android.bp
@@ -32,17 +32,10 @@
     ],
 }
 
+// TODO(b/211908498): remove this
 cc_defaults {
     name: "libbinder_ndk_host_user",
     target: {
-        host: {
-            cflags: [
-                "-D__INTRODUCED_IN(n)=",
-                "-D__assert(a,b,c)=do { syslog(LOG_ERR, a \": \" c); abort(); } while(false)",
-                // We want all the APIs to be available on the host.
-                "-D__ANDROID_API__=10000",
-            ],
-        },
         darwin: {
             enabled: false,
         },
@@ -52,7 +45,6 @@
 cc_library {
     name: "libbinder_ndk",
 
-    defaults: ["libbinder_ndk_host_user"],
     host_supported: true,
     recovery_available: true,