Fix local path assumption in interface_test.

Also fix a couple of other issues with the tests.

Test: Unit tests.
Change-Id: I6c2b2b5fad487460441487cc231a0e4a8d3897c7
diff --git a/benchmarks/Android.bp b/benchmarks/Android.bp
index 93f62cf..6cda463 100644
--- a/benchmarks/Android.bp
+++ b/benchmarks/Android.bp
@@ -96,6 +96,9 @@
         "tests/benchmark_test.cpp",
         "tests/interface_test.cpp",
     ],
-    static_libs: ["libBionicBenchmarksUtils"],
+    static_libs: [
+        "libbase",
+        "libBionicBenchmarksUtils",
+    ],
     data: ["suites/test_*.xml"],
 }