isEnabled = true if the user provided an externalSoMapping

Summary:
I'm adding an early return to `initEnableConfig` to forcefully enable SoLoader if the user provided an `externalSoMapping`.
This is to prevent that users in ReactNative 0.76+ need to alter their Manifest file.

Reviewed By: cipolleschi

Differential Revision: D62581049

fbshipit-source-id: c7ddfaf116263eb597045a00d5f7411fad2677e0

Author: cortinico

java/com/facebook/soloader/SoLoader.java

@@ -349,6 +349,13 @@ private static boolean initEnableConfig(Context context) {
       return true;
     }
 
+    if (SoLoader.externalSoMapping != null) {
+      // This case is used by React Native apps that use SoMerging in OSS.
+      // if the externalSoMapping has been provided, we don't need to check inside the Manifest
+      // if SoLoader is enabled or not.
+      return true;
+    }
+
     final String name = "com.facebook.soloader.enabled";
     Bundle metaData = null;
     String packageName = null;