Build: ARM KleidiCV HAL must be optional #26275
Description
relates #25443
Any "default" downloadable external components should be optional (self-disabled if they can't be downloaded) until it is requested by separate dedicated flag.
-- KLEIDICV: Downloading kleidicv-0.1.0.tar.gz from https://gitlab.arm.com/kleidi/kleidicv/-/archive/0.1.0/kleidicv-0.1.0.tar.gz
-- Try 1 failed
CMake Warning at cmake/OpenCVDownload.cmake:251 (message):
KLEIDICV: Download failed: 35;"SSL connect error"
For details please refer to the download log file:
CMakeDownloadLog.txt
Call Stack (most recent call first):
3rdparty/kleidicv/CMakeLists.txt:10 (ocv_download)
CMake Error at 3rdparty/kleidicv/CMakeLists.txt:23 (include):
include could not find requested file:
3rdparty/kleidicv/kleidicv-0.1.0/adapters/opencv/CMakeLists.txt