switch to packaged lzma package

vendor/github.com/kjk/lzma/util.go

@@ -0,0 +1,33 @@
+// Copyright (c) 2010, Andrei Vieru. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package lzma
+
+func minInt32(left int32, right int32) int32 {
+	if left < right {
+		return left
+	}
+	return right
+}
+
+func minUInt32(left uint32, right uint32) uint32 {
+	if left < right {
+		return left
+	}
+	return right
+}
+
+func maxInt32(left int32, right int32) int32 {
+	if left > right {
+		return left
+	}
+	return right
+}
+
+func maxUInt32(left uint32, right uint32) uint32 {
+	if left > right {
+		return left
+	}
+	return right
+}