Always add getApplicationInfo().nativeLibraryDir in soSource
Always add getApplicationInfo().nativeLibraryDir in soSource

Summary:
Soloader should always add [`getApplicationInfo().nativeLibraryDir`](https://developer.android.com/reference/android/content/pm/ApplicationInfo#nativeLibraryDir) in soSources list even the APK supports directly loading.

```
nativeLibraryDir Added in API level 9

public String nativeLibraryDir

Full path to the directory where native JNI libraries are stored.
```

Differential Revision: D29315016

fbshipit-source-id: 5e2df66dfef1be5bbd510e7f7d0a9fe611dd247a

facebook/SoLoader,facebook/SoLoader,facebook/SoLoader