Add cc_library tests

Add tests around reusing objects between static and shared
libraries.

Test: library_test.go
Change-Id: I1a1a01c5ea9f9edfbcaa5b29c39c281630e04f70
diff --git a/Android.bp b/Android.bp
index 3badfcd..a69c1ea 100644
--- a/Android.bp
+++ b/Android.bp
@@ -158,6 +158,7 @@
     ],
     testSrcs: [
         "cc/cc_test.go",
+        "cc/library_test.go",
         "cc/test_data_test.go",
     ],
     pluginFor: ["soong_build"],