Vcpkg commands cannot remove files under TFS source control

[IIFE]

Is your feature request related to a problem? Please describe.
When Vcpkg is checked into a TFS source control, commands that require files to be removed/renamed fail with std::errc::operation_not_permitted error. This is due to TFS only allowing reads of files under its source control.

One method Vcpkg gets around this is in the remove_package function, on line 76, where the following line is called:
fs::stdfs::permissions(target, fs::perms::owner_all | fs::perms::group_all, ec);

However, this is specific to some files, and not all removals carry out the above to ensure the removal takes place.

Because we are dealing with removals, we should ensure files are forcibly removed if we get std::errc::operation_not_permitted. The intent is to remove the file, so changing its permission to allow removals doesn't produce unnecessary side effects.

Proposed solution
Move the fs::stdfs::permissions(target, fs::perms::owner_all | fs::perms::group_all, ec); action to the low-level remove/rename functions so that it applies to all removals.

Please see this for the changes proposed

Happy to create a PR if people are happy with the proposed changes.

Thanks