build: tweak the library search path for firebase-cpp-sdk

On Android, we use arch variants to support multiple architecture ABI
variants. Adjust the default search path that we compute to include this
directory to repair the search of libraries.

Author: compnerd

CMakeLists.txt

@@ -32,9 +32,7 @@ target_include_directories(firebase INTERFACE
   third_party/firebase-development/usr/include)
 if(ANDROID)
   target_link_directories(firebase INTERFACE
-    third_party/firebase-development/usr/libs/android
-    third_party/firebase-development/usr/libs/android/deps/app
-    third_party/firebase-development/usr/libs/android/deps/app/external)
+    third_party/firebase-development/usr/libs/android/${CMAKE_ANDROID_ARCH_ABI})
 elseif(WIN32)
   target_link_directories(firebase INTERFACE
     third_party/firebase-development/usr/libs/windows