Merge commit 'efcea3a80da7c4479d5fe168435ecc9fd06bdc72' as 'subprojects/boost-sqlite'

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diff --git a/subprojects/boost-sqlite/include/boost/sqlite/mutex.hpp b/subprojects/boost-sqlite/include/boost/sqlite/mutex.hpp
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+//
+// Copyright (c) 2022 Klemens Morgenstern (klemens.morgenstern@gmx.net)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef BOOST_SQLITE_MUTEX_HPP
+#define BOOST_SQLITE_MUTEX_HPP
+
+#include <boost/sqlite/detail/config.hpp>
+#include <memory>
+
+BOOST_SQLITE_BEGIN_NAMESPACE
+/// A mutex class that maybe a noop depending on the mode sqlite3 was compiled as.
+struct mutex
+{
+  bool try_lock()
+  {
+    if (!impl_)
+      return false;
+    return sqlite3_mutex_try(impl_.get()) == SQLITE_OK;
+  }
+  void lock()   { sqlite3_mutex_enter(impl_.get()); }
+  void unlock() { sqlite3_mutex_leave(impl_.get()); }
+
+  mutex() : impl_(sqlite3_mutex_alloc(SQLITE_MUTEX_FAST)) {}
+  mutex(mutex && ) = delete;
+ private:
+  struct deleter_ {void operator()(sqlite3_mutex *mtx) {sqlite3_mutex_free(mtx);}};
+  std::unique_ptr<sqlite3_mutex, deleter_> impl_;
+};
+
+/// A recursive mutex class that maybe a noop depending on the mode sqlite3 was compiled as.
+struct recursive_mutex
+{
+  bool try_lock()
+  {
+    if (!impl_)
+      return false;
+    return sqlite3_mutex_try(impl_.get()) == SQLITE_OK;
+  }
+  void lock()   { sqlite3_mutex_enter(impl_.get()); }
+  void unlock() { sqlite3_mutex_leave(impl_.get()); }
+
+  recursive_mutex() : impl_(sqlite3_mutex_alloc(SQLITE_MUTEX_RECURSIVE)) {}
+  recursive_mutex(recursive_mutex && ) = delete;
+ private:
+  struct deleter_ {void operator()(sqlite3_mutex *mtx) {sqlite3_mutex_free(mtx);}};
+  std::unique_ptr<sqlite3_mutex, deleter_> impl_;
+};
+
+BOOST_SQLITE_END_NAMESPACE
+
+#endif //BOOST_SQLITE_MUTEX_HPP