gen: remove stale jl_cxx_files duplicate of src/

These eight .jl files (Mat, Vec, OpenCV, cv_cxx, cv_manual_wrap,
mat_conversion, types_conversion, typestructs) were inherited from
opencv_contrib/modules/julia/jl_cxx_files/, where they used to be
shipped inside OpenCV_jll. Since the move to per-repo Julia sources
under src/, the package loads only from src/ and Yggdrasil ships
only libopencv_julia.* (build_tarballs.jl drops the staged Julia
tree), so this directory's contents were never read at runtime and
had drifted from src/.

regenerate.jl only copies *wrap.jl from autogen_jl/ into
src/generated/, so removing it has no effect on that pipeline.
The Yggdrasil-side CMake copy line is dropped in the same change.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: ViralBShah

gen/CMakeLists.txt

@@ -115,7 +115,6 @@ execute_process(
                 )
 
 file(COPY ${CMAKE_CURRENT_BINARY_DIR}/gen/cpp_files/ DESTINATION ${CMAKE_CURRENT_BINARY_DIR}/gen/autogen_cpp)
-file(COPY ${CMAKE_CURRENT_BINARY_DIR}/gen/jl_cxx_files/ DESTINATION ${CMAKE_CURRENT_BINARY_DIR}/gen/autogen_jl)
 
 ocv_glob_module_sources()
 ocv_module_include_directories()