[syscalls-cpp] Add new port

[sapdragon]

This PR adds a new port for syscalls-cpp, a header-only C++ library for making direct syscalls on Windows x64. It uses a policy-based design for flexibility in memory allocation, stub generation, and syscall parsing.

• 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. (N/A, new library)
• 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. (N/A, no dependencies)
• 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.

[sapdragon]

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[BillyONeal]

This appears to take names which are likely to conflict with other packages or users, like <crt.h> or <hash.h>. Can they be installed into a subdirectory instead?

[sapdragon]

yes, the current version supports x86, I'll pull the port now and fix the file name collision

[sapdragon]

@BillyONeal everything normal now

[LilyWangLL]

Usage passed on x64-windows.

[BillyONeal]

I agree with @LilyWangLL

[sapdragon]

the tests failed even though nothing related to hashes was touched?

[sapdragon]

fixed @BillyONeal

[BillyONeal]

@LilyWangLL Can you look at this again?

[BillyONeal]

@sapdragon Thanks for the port! @LilyWangLL Thanks for the review!