ncurses: add ncurses 6.4 + conan v2

[madebr]

Specify library name and version: ncurses/6.4

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• I've read the contributing guidelines.
• I've used a recent Conan client version close to the currently deployed.
• I've tried at least one configuration locally with the conan-center hook activated.

[conan-center-bot]

Conan v1 pipeline ✔️

All green in build 8 (3f6300bf045d7a74d8e43c29449e97ea9decd71a):

• ncurses/6.4@:
  All packages built successfully! (All logs)

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Conan v2 pipeline (informative, not required for merge) ❌

Note: Conan v2 builds are informative and they are not required for the PR to be merged.

The v2 pipeline failed. Please, review the errors and note this will be required for pull requests to be merged in the near future.

See details:

Failure in build 8 (3f6300bf045d7a74d8e43c29449e97ea9decd71a):

• ncurses/6.4@:
  Error running command conan export --name ncurses --version 6.4 recipes/ncurses/all/conanfile.py:

  ERROR: Error loading conanfile at '/home/conan/w/prod-v2_cci_PR-15062/recipes/ncurses/all/conanfile.py': Unable to load conanfile in /home/conan/w/prod-v2_cci_PR-15062/recipes/ncurses/all/conanfile.py
    File "<frozen importlib._bootstrap_external>", line 728, in exec_module
    File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
    File "/home/conan/w/prod-v2_cci_PR-15062/recipes/ncurses/all/conanfile.py", line 1, in <module>
      from conans import AutoToolsBuildEnvironment, ConanFile, tools
  ImportError: cannot import name 'AutoToolsBuildEnvironment' from 'conans' (/opt/pyenv/versions/3.7.13/lib/python3.7/site-packages/conans/__init__.py)
  

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^{Note: To save resources, CI tries to finish as soon as an error is found. For this reason you might find that not all the references have been launched or not all the configurations for a given reference. Also, take into account that we cannot guarantee the order of execution as it depends on CI workload and workers availability.}

[github-actions]

Hooks produced the following warnings for commit 3f6300b

ncurses/6.4

post_package(): WARN: [MISSING SYSTEM LIBS (KB-H043)] Library './lib/libncurses++w.so' links to system library 'util' but it is not in cpp_info.system_libs.
post_package(): WARN: [APPLE RELOCATABLE SHARED LIBS (KB-H077)] install_name dir of these shared libs is not @rpath: libformw.dylib, libncurses++w.6.dylib, libncursesw.dylib, libpanelw.6.dylib, libtinfow.6.dylib, libpanelw.dylib, libmenuw.dylib, libmenuw.6.dylib, libncursesw.6.dylib, libticw.dylib, libncurses++w.dylib, libticw.6.dylib, libtinfow.dylib, libformw.6.dylib

[uilianries]

LGTM