[restinio] Update, fix exported config, fix build warnings

[dg0yt]

Extendd version of #30578

• Changes comply with the maintainer guide
• SHA512s are updated for each updated download
• The "supports" clause reflects platforms that may be fixed by this new version
• Any fixed CI baseline entries are removed from that file.
• Any patches that are no longer applied are deleted from the port's directory.
• The version database is fixed by rerunning ./vcpkg x-add-version --all and committing the result.
• Only one version is added to each modified port's versions file.

[dg0yt]

The restinio CMake build system is at least unusual.

• /: no CMakeLists.txt.
• /dev: main cmake project. Would add extra of dependencies (via find_package or vendored copies) which are not needed for the header only lib AFAIU. (But wouldn't do that if used as part another CMake project...)
• /dev/restinio: lib CMake project, but incomplete initialization.
• /vcpkg: vcpkg CMake project. Adds /dev/restinio as a subdirectory. But currently lacks a project call, making find_ calls fragile.

IMO the vcpkg dir shouldn't be needed if the other project could be sufficiently configured via input variables. No vcpkg particularities should be maintained upstream.

[jimwang118]

The usage has been tested successfully locally.

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

[eao197]

@dg0yt , thanks for your help!