MinGW std:🧵 suppress redundancy warning for non-debug builds

See: #216

src/3rdparty/mingw-std-threads/mingw.condition_variable.h

@@ -536,7 +536,7 @@ namespace std
 using mingw_stdthread::cv_status;
 using mingw_stdthread::condition_variable;
 using mingw_stdthread::condition_variable_any;
-#elif !defined(MINGW_STDTHREAD_REDUNDANCY_WARNING)  //  Skip repetition
+#elif !defined(MINGW_STDTHREAD_REDUNDANCY_WARNING) && defined(_DEBUG)  //  Skip repetition
 #define MINGW_STDTHREAD_REDUNDANCY_WARNING
 #pragma message "This version of MinGW seems to include a win32 port of\
  pthreads, and probably already has C++11 std threading classes implemented,\

src/3rdparty/mingw-std-threads/mingw.mutex.h

@@ -461,7 +461,7 @@ using mingw_stdthread::recursive_timed_mutex;
 using mingw_stdthread::timed_mutex;
 using mingw_stdthread::once_flag;
 using mingw_stdthread::call_once;
-#elif !defined(MINGW_STDTHREAD_REDUNDANCY_WARNING)  //  Skip repetition
+#elif !defined(MINGW_STDTHREAD_REDUNDANCY_WARNING) && defined(_DEBUG)  //  Skip repetition
 #define MINGW_STDTHREAD_REDUNDANCY_WARNING
 #pragma message "This version of MinGW seems to include a win32 port of\
  pthreads, and probably already has C++11 std threading classes implemented,\

src/3rdparty/mingw-std-threads/mingw.shared_mutex.h

@@ -484,7 +484,7 @@ using mingw_stdthread::shared_mutex;
 #if (__cplusplus < 201402L) || (defined(__MINGW32__ ) && !defined(_GLIBCXX_HAS_GTHREADS))
 using mingw_stdthread::shared_timed_mutex;
 using mingw_stdthread::shared_lock;
-#elif !defined(MINGW_STDTHREAD_REDUNDANCY_WARNING)  //  Skip repetition
+#elif !defined(MINGW_STDTHREAD_REDUNDANCY_WARNING) && defined(_DEBUG)  //  Skip repetition
 #define MINGW_STDTHREAD_REDUNDANCY_WARNING
 #pragma message "This version of MinGW seems to include a win32 port of\
  pthreads, and probably already has C++ std threading classes implemented,\

src/3rdparty/mingw-std-threads/mingw.thread.h

@@ -384,7 +384,7 @@ namespace this_thread
 {
 using namespace mingw_stdthread::this_thread;
 }
-#elif !defined(MINGW_STDTHREAD_REDUNDANCY_WARNING)  //  Skip repetition
+#elif !defined(MINGW_STDTHREAD_REDUNDANCY_WARNING) && defined(_DEBUG)  //  Skip repetition
 #define MINGW_STDTHREAD_REDUNDANCY_WARNING
 #pragma message "This version of MinGW seems to include a win32 port of\
  pthreads, and probably already has C++11 std threading classes implemented,\