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features2d: performance optimization of detect function on Windows-ARM64 #27776 ### 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 - This PR improves the performance of the detect function on Windows ARM64 targets. - Added the defined(_M_ARM64) macro in agast.cpp and agast_score.cpp files, aligning ARM64 behavior with how x64 selects internal functions for computation. - As a result, ARM64 now executes the same internal functions as x64 where applicable, leading to measurable performance improvements in detect function. - This changes is limited to Windows ARM64 and does not affect other architectures **Performance impact:** - Detect function shows improved runtime on ARM64 targets due to reuse of existing efficient computation paths. <img width="1419" height="408" alt="image" src="https://github.com/user-attachments/assets/feab411a-d256-4bff-bec2-22b2583f63d1" />