Merge pull request #25832 from chachoi-world:4.x

Add support for QNX #25832

Build and test instruction for QNX:
https://github.com/chachoi-world/qnx-ports/blob/main/opencv/README.md

### Pull Request Readiness Checklist

See details at https://github.com/opencv/opencv/wiki/How_to_contribute#making-a-good-pull-request

- [x] I agree to contribute to the project under Apache 2 License.
- [x] To the best of my knowledge, the proposed patch is not based on a code under GPL or another license that is incompatible with OpenCV
- [x] The PR is proposed to the proper branch
- [ ] There is a reference to the original bug report and related work
- [ ] There is accuracy test, performance test and test data in opencv_extra repository, if applicable
      Patch to opencv_extra has the same branch name.
- [ ] The feature is well documented and sample code can be built with the project CMake

modules/core/src/system.cpp

@@ -46,6 +46,15 @@
 #include <iostream>
 #include <ostream>
 
+#ifdef __QNX__
+    #include <unistd.h>
+    #include <sys/neutrino.h>
+    #include <sys/syspage.h>
+#ifdef __aarch64__
+    #include <aarch64/syspage.h>
+#endif
+#endif
+
 #include <opencv2/core/utils/configuration.private.hpp>
 #include <opencv2/core/utils/trace.private.hpp>