Android: Add support for sharing debug.txt (#12370)

src/porting_android.h

@@ -60,6 +60,13 @@ void showInputDialog(const std::string &acceptButton,
 
 void openURIAndroid(const std::string &url);
 
+/**
+ * Opens a share intent to the file at path
+ *
+ * @param path
+ */
+void shareFileAndroid(const std::string &path);
+
 /**
  * WORKAROUND for not working callbacks from java -> c++
  * get current state of input dialog