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,
 
diff --git a/libs/binder/ndk/include_ndk/android/binder_status.h b/libs/binder/ndk/include_ndk/android/binder_status.h
index 6f1fdfc..76c7aac 100644
--- a/libs/binder/ndk/include_ndk/android/binder_status.h
+++ b/libs/binder/ndk/include_ndk/android/binder_status.h
@@ -32,11 +32,26 @@
 
 __BEGIN_DECLS
 
-#ifndef __ANDROID_API__
-#error Android builds must be compiled against a specific API. If this is an \
- android platform host build, you must use libbinder_ndk_host_user.
+#ifndef __BIONIC__
+
+#ifndef __INTRODUCED_IN
+#define __INTRODUCED_IN(n)
 #endif
 
+#ifndef __assert
+#define __assert(a, b, c)          \
+    do {                           \
+        syslog(LOG_ERR, a ": " c); \
+        abort();                   \
+    } while (false)
+#endif
+
+#ifndef __ANDROID_API__
+#define __ANDROID_API__ 10000
+#endif
+
+#endif  // __BIONIC__
+
 /**
  * Low-level status types for use in binder. This is the least preferable way to
  * return an error for binder services (where binder_exception_t should be used,