Missing lookup for dependency Threads

[MonicaLiu0311]

Missing lookup for dependency Threads in config file, temporarily fix it in vcpkg as a patch until a new version is released:

1> [CMake] CMake Error at build/debug/vcpkg_installed/x64-windows/share/avcpp/avcpp-targets.cmake:61 (set_target_properties):
1> [CMake]   The link interface of target "avcpp::avcpp" contains:
1> [CMake] 
1> [CMake]     Threads::Threads
1> [CMake] 
1> [CMake]   but the target was not found.  Possible reasons include:
1> [CMake] 
1> [CMake]     * There is a typo in the target name.
1> [CMake]     * A find_package call is missing for an IMPORTED target.
1> [CMake]     * An ALIAS target is missing.
1> [CMake] 
1> [CMake] Call Stack (most recent call first):
1> [CMake]   build/debug/vcpkg_installed/x64-windows/share/avcpp/avcpp-config.cmake:26 (include)
1> [CMake]   vcpkg/scripts/buildsystems/vcpkg.cmake:859 (_find_package)
1> [CMake]   CMakeLists.txt:16 (find_package)