android: fix native library inclusion

src/android/app/build.gradle

@@ -70,6 +70,8 @@ android {
                         "-DANDROID_STL=c++_shared"
 
                 abiFilters "arm64-v8a"
+
+                targets "citra-android"
             }
         }
     }

src/android/app/src/main/cpp/CMakeLists.txt

@@ -1,6 +1,6 @@
 cmake_minimum_required(VERSION 3.8)
 
-add_library(citra-android STATIC
+add_library(citra-android SHARED
             dummy.cpp
             )