Package prebuilt libraries in android target (#105)

Summary:
package prebuilt libraries in `:android` rather than in sample app
Closes https://github.com/facebook/Sonar/pull/105

Reviewed By: passy

Differential Revision: D8639064

Pulled By: priteshrnandgaonkar

fbshipit-source-id: 4da20b046e2e55f0f605f91bf8809a4efd6848d9

android/build.gradle

@@ -224,6 +224,9 @@ android {
             res {
                 srcDir 'res'
             }
+            jniLibs {
+                srcDir 'third-party/OpenSSL/libs'
+            }
         }
     }
     externalNativeBuild {

android/sample/build.gradle

@@ -22,7 +22,6 @@ android {
             res {
                 srcDir 'res'
             }
-            jniLibs.srcDirs = ['../third-party/OpenSSL/libs']
         }
     }