Use feature macro to check for support of filesystem
Rather than defaulting to std::experimental::filesystem in files.h a feature
macro can be used to determine what stdfs uses.
MODIFY
include/vcpkg/base/files.h
include/vcpkg/base/files.h
#include <vcpkg/base/expected.h>
-#if defined(_WIN32)
+#if defined(_WIN32) || defined(__cpp_lib_filesystem)
#include <filesystem>
#else
#include <experimental/filesystem>
namespace fs
{
+#ifdef __cpp_lib_filesystem
+ namespace stdfs = std::filesystem;
+#else
namespace stdfs = std::experimental::filesystem;
+#endif
using stdfs::copy_options;
using stdfs::file_status;

Use feature macro to check for support of filesystem

Rather than defaulting to std::experimental::filesystem in files.h a feature
macro can be used to determine what stdfs uses.