message: added missing conversion from #ifdef to #if
diff: @@ -112,7 +112,7 @@ public:
  /// Attempt to check if the mutex is valid (only relevant if not emulating)
  bool is_valid() noexcept;
  -#ifdef REALM_ROBUST_MUTEX_EMULATION
  +#if REALM_ROBUST_MUTEX_EMULATION
  constexpr static bool is_robust_on_this_platform = true; // we're faking it!
  #else
  constexpr static bool is_robust_on_this_platform = RobustMutex::is_robust_on_this_platform;
  @@ -397,9 +397,10 @@ inline bool InterprocessMutex::is_valid() noexcept
  #if REALM_ROBUST_MUTEX_EMULATION
  return true;
  #elif defined(_WIN32)
  - // There is no safe way of testing if the m_handle mutex handle is valid on Windows, without having bad side effects
  - // for the cases where it is indeed invalid. If m_handle contains an arbitrary value, it might by coincidence be equal
  - // to a real live handle of another kind. This excludes a try_lock implementation and many other ideas.
  + // There is no safe way of testing if the m_handle mutex handle is valid on Windows, without having bad side
  + // effects for the cases where it is indeed invalid. If m_handle contains an arbitrary value, it might by
  + // coincidence be equal to a real live handle of another kind. This excludes a try_lock implementation and many
  + // other ideas.
  return true;
  #else
  REALM_ASSERT(m_shared_part);
  