Godeps, vendor: convert dependency management to trash (#3198)

This commit converts the dependency management from Godeps to the vendor
folder, also switching the tool from godep to trash. Since the upstream tool
lacks a few features proposed via a few PRs, until those PRs are merged in
(if), use github.com/karalabe/trash.

You can update dependencies via trash --update.

All dependencies have been updated to their latest version.

Parts of the build system are reworked to drop old notions of Godeps and
invocation of the go vet command so that it doesn't run against the vendor
folder, as that will just blow up during vetting.

The conversion drops OpenCL (and hence GPU mining support) from ethash and our
codebase. The short reasoning is that there's noone to maintain and having
opencl libs in our deps messes up builds as go install ./... tries to build
them, failing with unsatisfied link errors for the C OpenCL deps.

golang.org/x/net/context is not vendored in. We expect it to be fetched by the
user (i.e. using go get). To keep ci.go builds reproducible the package is
"vendored" in build/_vendor.

1 files changed, 50 insertions, 0 deletions

diff --git a/vendor/gopkg.in/natefinch/npipe.v2/doc.go b/vendor/gopkg.in/natefinch/npipe.v2/doc.go
new file mode 100644
index 000000000..3445773b4
--- /dev/null
+++ b/vendor/gopkg.in/natefinch/npipe.v2/doc.go
@@ -0,0 +1,50 @@
+// Copyright 2013 Nate Finch. All rights reserved.
+// Use of this source code is governed by an MIT-style
+// license that can be found in the LICENSE file.
+
+// Package npipe provides a pure Go wrapper around Windows named pipes.
+//
+// !! Note, this package is Windows-only.  There is no code to compile on linux.
+//
+// Windows named pipe documentation: http://msdn.microsoft.com/en-us/library/windows/desktop/aa365780
+//
+// Note that the code lives at https://github.com/natefinch/npipe (v2 branch)
+// but should be imported as gopkg.in/natefinch/npipe.v2 (the package name is
+// still npipe).
+//
+// npipe provides an interface based on stdlib's net package, with Dial, Listen,
+// and Accept functions, as well as associated implementations of net.Conn and
+// net.Listener.  It supports rpc over the connection.
+//
+// Notes
+//
+// * Deadlines for reading/writing to the connection are only functional in Windows Vista/Server 2008 and above, due to limitations with the Windows API.
+//
+// * The pipes support byte mode only (no support for message mode)
+//
+// Examples
+//
+// The Dial function connects a client to a named pipe:
+//   conn, err := npipe.Dial(`\\.\pipe\mypipename`)
+//   if err != nil {
+//   	<handle error>
+//   }
+//   fmt.Fprintf(conn, "Hi server!\n")
+//   msg, err := bufio.NewReader(conn).ReadString('\n')
+//   ...
+//
+// The Listen function creates servers:
+//
+//   ln, err := npipe.Listen(`\\.\pipe\mypipename`)
+//   if err != nil {
+//   	// handle error
+//   }
+//   for {
+//   	conn, err := ln.Accept()
+//   	if err != nil {
+//   		// handle error
+//   		continue
+//   	}
+//   	go handleConnection(conn)
+//   }
+package npipe