CatBoost-1.2-gfbf-2023a.eb fails on RHEL9 because it uses openssl/1.1.1s via Conan

[boegel]

Sanity check for CatBoost/1.2-gfbf-2023a fails on RHEL9 with:

ImportError: /software/CatBoost/1.2-gfbf-2023a/lib/python3.11/site-packages/catboost/_catboost.so: undefined symbol: SSL_get1_peer_certificate,  (at easybuild/framework/easyblock.py:3669 in _sanity_check_step)

Problem is that _catboost.so gets linked to an openssl/1.1.1s that is obtained via Conan:

  -- Conan: Found program /software/conan/1.60.2-GCCcore-12.3.0/bin/conan
  -- Conan: Version found Conan version 1.60.2
  -- Conan executing: /conan/1.60.2-GCCcore-12.3.0/bin/conan install /tmp/easybuild/CatBoost/1.2/gfbf-2023a/CatBoost/catboost-1.2/catboost_all_src --remote conancenter --install-folder /tmp/easybuild/CatBoost/1.2/gfbf-2023a/CatBoost/catboost-1.2/build/temp.linux-x86_64-cpython-311 --build missing --env CONAN_CMAKE_GENERATOR=Ninja --settings build_type=Release --settings compiler=clang --settings compiler.version=16 --settings compiler.libcxx=libstdc++11 --settings compiler.cppstd=20 --conf tools.cmake.cmaketoolchain:generator=Ninja
  Configuration:
  [settings]
  arch=x86_64
  arch_build=x86_64
  build_type=Release
  compiler=clang
  compiler.cppstd=20
  compiler.libcxx=libstdc++11
  compiler.version=16
  os=Linux
  os_build=Linux
  [options]
  [build_requires]
  [env]
  CONAN_CMAKE_GENERATOR=Ninja
  [conf]
  tools.cmake.cmaketoolchain:generator=Ninja

  conanfile.txt: Installing package
  Requirements
      libiconv/1.15 from 'conancenter' - Cache
      openssl/1.1.1s from 'conancenter' - Cache
      zlib/1.2.13 from 'conancenter' - Cache
  Packages
      libiconv/1.15:c6f9039f2ddafd2e1452deeeb59e849e8ccc1eec - Cache
      openssl/1.1.1s:b293902f842cdd85ecde7f677cdbeea7070d8e14 - Cache
      zlib/1.2.13:b293902f842cdd85ecde7f677cdbeea7070d8e14 - Cache

So we'll need to figure out how to "tame" Conan, so it doesn't download stuff on the fly, and so we can convince it to use the system OpenSSL (3.x) provided by RHEL9 (along with libiconv and zlib dependencies provided by EasyBuild)