Add LICENSE.txt to the one-liner.

[BillyONeal]

Olga discovered that vcpkg-cmake expects a LICENSE.txt in VCPKG_ROOT. This includes that in the standalone bundle.

See https://github.com/microsoft/vcpkg/blob/57d3194e702a2959e86a6748999ad71fc24f7922/ports/vcpkg-cmake/portfile.cmake#L13

[ras0219-msft]

LGTM, but we should seek to fix this in the future by either making vcpkg-cmake have its own included license file or maybe have a dedicated vcpkg-license port that other helpers can depend upon to avoid copy-pasting the license into every helper port..

[BillyONeal]

LGTM, but we should seek to fix this in the future by either making vcpkg-cmake have its own included license file or maybe have a dedicated vcpkg-license port that other helpers can depend upon to avoid copy-pasting the license into every helper port..

At this point the license is contractual so not sure if there's much benefit in avoiding it.

[dg0yt]

we should seek to fix this in the future by either making vcpkg-cmake have its own included license file or maybe have a dedicated vcpkg-license port that other helpers can depend upon to avoid copy-pasting the license into every helper port..

The idea is that the helper ports are part of vcpkg and use exactly the same license, implemented by using exactly the same file.

[ras0219-msft]

While the deduplication gained by relying on the vcpkg root copy is nice, it adds an unexpected contract (the license must forevermore be deployed with $NAME under $VCPKG_ROOT).

Though as BillyONeal said above, that ship has already sailed.