v1.0.4 unix fix stat on unknown file type

v1.0.4

commit 78ddd19 (HEAD -> master, origin/master)
Author: Jan Palus [email protected]
Date: Mon Jun 17 15:55:32 2024 +0200

unix: fix stat on unknown file type

make sure `unknownFileMode` const value matches what is returned when
file type failed to be determmined

commit 9e83309
Author: Charlie Vieth [email protected]
Date: Sat Apr 6 01:25:18 2024 -0400

fastwalk: save a call to Stat when following links

This also changes the code to immediately check if root exists.

commit 386c69b
Author: Charlie Vieth [email protected]
Date: Sat Apr 6 01:07:16 2024 -0400

mod: remove empty go.sum file

commit f3655c0
Author: Charlie Vieth [email protected]
Date: Sat Apr 6 01:01:58 2024 -0400

all: reconcile build tags with internal/dirent package and test builds

This mostly fixes the cluster fuck of build directives and reconciles
them to match the Unix platforms supported by internal/dirent + darwin
it also removes the appengine crap that was a legacy of the original
code.