Tell the java wrapper to use the fbcode java

Summary:
The flag to use in fbandroid is `-Duses_native_libraries` passed in via `vm_args`

In `fbandroid/third-party/build-tools/java/java.sh` looks for this flag to override the default java with the fbcode runtime java.

Reviewed By: ryandm

Differential Revision: D4024857

fbshipit-source-id: 0ace0ee94fea32376a24004582556fa1d7d2e222

java/BUCK

@@ -51,6 +51,9 @@ java_test(
     ':java',
     JUNIT_TARGET,
   ],
+  vm_args = [
+    '-Duses_native_libraries',
+  ],
   use_cxx_libraries = True,
   cxx_library_whitelist = CXX_LIBRARY_WHITELIST,
 )