fb0788f18f
As it's just an alias for filepath.IsAbs. Also added a normalize step in TrimBuildFilesFromExcludes, so that callers are not _required_ to first normalize the path. We are considering deprecating and/or removing this function in the archive package, so removing it in the cli code helps transitioning if we decide to deprecate and/or remove it. Signed-off-by: Sebastiaan van Stijn <github@gone.nl>