vendor: Add github.com/cznic/lldb and friends (new recursive dependency)

vendor/github.com/edsrzf/mmap-go/msync_netbsd.go

@@ -0,0 +1,8 @@
+// Copyright 2011 Evan Shaw. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package mmap
+
+const _SYS_MSYNC = 277
+const _MS_SYNC = 0x04