Update react-native to v0.64.3

android/app/build.gradle

@@ -121,6 +121,7 @@ def jscFlavor = 'org.webkit:android-jsc:+'
 def enableHermes = project.ext.react.get("enableHermes", false);
 
 android {
+    ndkVersion rootProject.ext.ndkVersion
     compileSdkVersion rootProject.ext.compileSdkVersion
     buildToolsVersion rootProject.ext.buildToolsVersion
 
@@ -191,11 +192,12 @@ android {
         variant.outputs.each { output ->
             // For each separate APK per architecture, set a unique version code as described here:
             // https://developer.android.com/studio/build/configure-apk-splits.html
+            // Example: versionCode 1 will generate 1001 for armeabi-v7a, 1002 for x86, etc.
             def versionCodes = ["armeabi-v7a": 1, "x86": 2]
             def abi = output.getFilter(OutputFile.ABI)
             if (abi != null) {  // null for the universal-debug, universal-release variants
                 output.versionCodeOverride =
-                        versionCodes.get(abi) * 1048576 + defaultConfig.versionCode
+                        defaultConfig.versionCode * 1000 + versionCodes.get(abi)
             }
         }
     }