libnativeloader: remove stubs for now.

Seems to break VMDebug test.

Also add missed strdup in returned error message.

bug: 122957265
Test: VMDebug
Change-Id: I64727d707f20c0e6afcb5455edf20c99011a81dc

libnativeloader/Android.bp

@@ -23,15 +23,6 @@ cc_library {
         "llndk.libraries.txt",
         "vndksp.libraries.txt",
     ],
-    target: {
-        android: {
-            version_script: "libnativeloader.map.txt",
-        },
-    },
-    stubs: {
-        symbol_file: "libnativeloader.map.txt",
-        versions: ["1"],
-    },
 }
 
 cc_library_headers {

libnativeloader/native_loader.cpp

@@ -632,7 +632,7 @@ void* OpenNativeLibrary(JNIEnv* env, int32_t target_sdk_version, const char* pat
     *needs_native_bridge = false;
     void* handle = dlopen(path, RTLD_NOW);
     if (handle == nullptr) {
-      *error_msg = dlerror();
+      *error_msg = strdup(dlerror());
     }
     return handle;
   }