fix(windows): lock claim validation boundary

tools/tht/internal/safeio/claim_unix.go

@@ -10,6 +10,10 @@ import (
 	"golang.org/x/sys/unix"
 )
 
+func lockCanonicalPrivateClaimOperation() func() {
+	return func() {}
+}
+
 func claimCanonicalPrivateRegular(source, claim string) (bool, error) {
 	directory, sourceName, err := openCanonicalParentDirectory(source)
 	if err != nil {