[cln] add libcln

[endingly]

• Changes comply with the maintainer guide
• The name of the port matches an existing name for this component on https://repology.org/ if possible, and/or is strongly associated with that component on search engines.
• Optional dependencies are resolved in exactly one way. For example, if the component is built with CMake, all find_package calls are REQUIRED, are satisfied by vcpkg.json's declared dependencies, or disabled with CMAKE_DISABLE_FIND_PACKAGE_Xxx
• The versioning scheme in vcpkg.json matches what upstream says.
• The license declaration in vcpkg.json matches what upstream says.
• The installed as the "copyright" file matches what upstream says.
• The source code of the component installed comes from an authoritative source.
• The generated "usage text" is accurate. See adding-usage for context.
• The version database is fixed by rerunning ./vcpkg x-add-version --all and committing the result.
• Only one version is in the new port's versions file.
• Only one version is added to each modified port's versions file.

[LilyWangLL]

Thanks for your PR, please fix the build error on CI pipeline. If this port doesn't support these triplets, please add supports in vcpkg.json.

libcln:x64-uwp
libcln:arm-uwp
libcln:arm-neon-android

[LilyWangLL]

Note: I will be converting your PR to draft status. When you respond, please revert to "ready for review". That way, I can be aware that you've responded since you can't modify the tags.

[endingly]

Thanks for your PR, please fix the build error on CI pipeline. If this port doesn't support these triplets, please add supports in vcpkg.json.

libcln:x64-uwp
libcln:arm-uwp
libcln:arm-neon-android

What is platform expression of arm-neon-android ?

[dg0yt]

IMO the usage should be trimmed to

cln provides CMake targets:

    find_package(cln CONFIG REQUIRED)
    target_link_libraries(main PRIVATE cln::cln)

[dg0yt]

Is this a general limitation, or just the lack of Windows DLL export definitions?

[endingly]

For Windows, if compiling dynamic libraries, two errors will occur:

1. redefinition of symbol
2. unable to parse some symbols in the library

[endingly]

Okay, I gave up. I moved Windows out of the support list.

[dg0yt]

if(VCPKG_TARGET_IS_WINDOWS)
    vcpkg_check_linkage(ONLY_STATIC_LIBRARY)
endif()

[LilyWangLL]

Closing this PR since it seems that no progress is being made. Please ping us to reopen if work is still being done.