Fix for object store build issues on Android

src/impl/android/external_commit_helper.cpp

@@ -19,8 +19,8 @@
 #include "impl/external_commit_helper.hpp"
 #include "impl/realm_coordinator.hpp"
 
-
 #include <assert.h>
+#include <errno.h>
 #include <fcntl.h>
 #include <sstream>
 #include <sys/epoll.h>
@@ -36,9 +36,6 @@
 #define ANDROID_LOG(...)
 #endif
 
-#include <errno.h>
-#include <sstream>
-
 using namespace realm;
 using namespace realm::_impl;
 

src/impl/android/weak_realm_notifier.cpp

@@ -19,6 +19,7 @@
 #include "impl/weak_realm_notifier.hpp"
 #include "shared_realm.hpp"
 
+#include <errno.h>
 #include <fcntl.h> 
 #include <unistd.h>
 #include <android/log.h>

src/shared_realm.hpp

@@ -132,6 +132,8 @@ namespace realm {
         // Realm after closing it will produce undefined behavior.
         void close();
 
+        bool is_closed() { return m_shared_group == nullptr; }
+
         ~Realm();
 
         void init(std::shared_ptr<_impl::RealmCoordinator> coordinator);