cmake: brush up the cmake part of merging option #24745
Merged
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Sorry for submitting multiple PRs.
This is a follow-up of #24642 and #24698
I just concluded that
ifsection of each compiler should correspond where defining the option and calling theocv_cpu_aarch64_baseline_merge_feature_optionsPull Request Readiness Checklist
See details at https://github.com/opencv/opencv/wiki/How_to_contribute#making-a-good-pull-request
Patch to opencv_extra has the same branch name.