Merge pull request #19985 from fpetrogalli:disable_threads

* [build][option] Introduce `OPENCV_DISABLE_THREAD_SUPPORT` option.

The option forces the library to build without thread support.

* update handling of OPENCV_DISABLE_THREAD_SUPPORT

- reduce amount of #if conditions

* [to squash] cmake: apply mode vars in toolchains too

Co-authored-by: Alexander Alekhin <alexander.a.alekhin@gmail.com>

modules/core/src/utils/logtagmanager.hpp

@@ -37,8 +37,8 @@ private:
     // also, extensible functions (accepting user-provided callback) are not allowed
     // to call LogTagManger (to prevent iterator invalidation), which needs enforced
     // with a non-recursive mutex.
-    using MutexType = std::mutex;
-    using LockType = std::lock_guard<MutexType>;
+    using MutexType = cv::Mutex;
+    using LockType = cv::AutoLock;
 
     enum class MatchingScope
     {