Also known as "chmod".
The process must have the correct privileges in order to do this successfully, or must have the effective user ID matching the owner of the file.
pub fn setPermissions(file: File, io: Io, new_permissions: Permissions) SetPermissionsError!void
pub fn setPermissions(file: File, io: Io, new_permissions: Permissions) SetPermissionsError!void {
return io.vtable.fileSetPermissions(io.userdata, file, new_permissions);
}