[delaunator-cpp] Add new port

[myd7349]

• 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.

[dg0yt]

IIUC a vendored variant of this code is included in port pdal.

[myd7349]

IIUC a vendored variant of this code is included in port pdal.

Yes. It is imported as part of PDAL in this PR: PDAL/PDAL#2237 and this PR was merged by the current maintainer of delaunator-cpp.

https://github.com/PDAL/PDAL/tree/master/filters/private