intel-oneapi-toolkit: add unified 2026.0.0.198 recipe

Intel oneAPI 2026.0 ships the former Base and HPC toolkits as a
single offline self-extracting installer instead of as the per-
component apt packages used in the 2021/2024 layout. Add a recipe
that consumes intel-oneapi-toolkit-2026.0.0.198_offline.sh via a
pseudo-free do_unpack_vendor task and stages /opt/intel/oneapi
into the rootfs.

The recipe partitions the installed tree into sub-packages along
component boundaries: intel-oneapi-toolkit-{compiler,runtime,mkl,
tbb,dpl,debugger,ipp,ccl,vtune,common,licensing}. Consumers should
reference these canonical sub-package names directly rather than
the per-component apt names that the 2021/2024 standalone recipes
exposed.

The runtime sub-package additionally:

* registers /opt/intel/oneapi/compiler/2026.0/lib/libintelocl.so as
  /etc/OpenCL/vendors/intel-cpu.icd so systems without an Intel GPU
  expose an Intel OpenCL platform via the standard ICD mechanism;

* installs a libxml2.so.2 -> libxml2.so.16 SONAME compat symlink,
  because the prebuilt libcommon_clang.so / libintelocl.so are
  linked against the libxml2 2.x SONAME while current oe-core ships
  libxml2 3.x as libxml2.so.16. libxml2 3.x is API-compatible with
  the option-parsing surface the binaries use.

The bundle is x86_64-only so COMPATIBLE_HOST is restricted.

Signed-off-by: Yogesh Tyagi <yogesh.tyagi@intel.com>

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