Adding upstream version 1.34.4.

Signed-off-by: Daniel Baumann <daniel@debian.org>

tools/readme_linter/set.go

@@ -0,0 +1,32 @@
+package main
+
+type set struct {
+	m map[string]struct{}
+}
+
+func (s *set) add(key string) {
+	s.m[key] = struct{}{}
+}
+
+func (s *set) has(key string) bool {
+	var ok bool
+	_, ok = s.m[key]
+	return ok
+}
+
+func (s *set) forEach(f func(string)) {
+	for key := range s.m {
+		f(key)
+	}
+}
+
+func newSet(elems []string) *set {
+	s := &set{
+		m: make(map[string]struct{}),
+	}
+
+	for _, elem := range elems {
+		s.add(elem)
+	}
+	return s
+}