Merge pull request #26713 from homuler:fix/build-ios-framework

Ensure Obj-C header files are generated correctly if under /private/var #26713

Fix #26712 

### 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
- [ ] 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/objc/generator/gen_objc.py

@@ -1662,7 +1662,9 @@ if __name__ == "__main__":
                h_files += [os.path.join(root, filename) for filename in fnmatch.filter(filenames, '*.h')]
                hpp_files += [os.path.join(root, filename) for filename in fnmatch.filter(filenames, '*.hpp')]
             srcfiles = h_files + hpp_files
-            srcfiles = [f for f in srcfiles if not re_bad.search(f.replace('\\', '/'))]
+            # Use relative paths to avoid being affected by the name of the parent directory.
+            # See https://github.com/opencv/opencv/issues/26712
+            srcfiles = [f for f in srcfiles if not re_bad.search(os.path.relpath(f, module_location).replace('\\', '/'))]
         logging.info("\nFiles (%d):\n%s", len(srcfiles), pformat(srcfiles))
 
         common_headers_fname = os.path.join(misc_location, 'filelist_common')