Vendor in containers/buildah@v1.26.1

Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>

vendor/github.com/containers/buildah/imagebuildah/util.go

@@ -10,3 +10,13 @@ import (
 func InitReexec() bool {
 	return buildah.InitReexec()
 }
+
+// argsMapToSlice returns the contents of a map[string]string as a slice of keys
+// and values joined with "=".
+func argsMapToSlice(m map[string]string) []string {
+	s := make([]string, 0, len(m))
+	for k, v := range m {
+		s = append(s, k+"="+v)
+	}
+	return s
+}