Add dummy Go packages for vendoring of C files

dummy.go

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+// +build dummy
+
+// This file is part of a workaround for `go mod vendor` which won't vendor
+// C files if there's no Go file in the same directory.
+// This would prevent the hidapi/hidapi/hidapi.h file to be vendored.
+//
+// This Go file imports the c directory where there is another dummy.go file which
+// is the second part of this workaround.
+//
+// These two files combined make it so `go mod vendor` behaves correctly.
+//
+// See this issue for reference: https://github.com/golang/go/issues/26366
+
+package main
+
+import (
+	_ "github.com/karalabe/usb/hidapi"
+	_ "github.com/karalabe/usb/hidapi/hidapi"
+	_ "github.com/karalabe/usb/hidapi/libusb"
+	_ "github.com/karalabe/usb/hidapi/mac"
+	_ "github.com/karalabe/usb/hidapi/windows"
+	_ "github.com/karalabe/usb/libusb"
+	_ "github.com/karalabe/usb/libusb/libusb"
+	_ "github.com/karalabe/usb/libusb/libusb/os"
+)

hidapi/dummy.go

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+// +build dummy
+
+// Package c contains only a C file.
+//
+// This Go file is part of a workaround for `go mod vendor`.
+// Please see the file dummy.go at the root of the module for more information.
+package hidapi

hidapi/hidapi/dummy.go

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+// +build dummy
+
+// Package c contains only a C file.
+//
+// This Go file is part of a workaround for `go mod vendor`.
+// Please see the file dummy.go at the root of the module for more information.
+package hidapi

hidapi/libusb/dummy.go

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+// +build dummy
+
+// Package c contains only a C file.
+//
+// This Go file is part of a workaround for `go mod vendor`.
+// Please see the file dummy.go at the root of the module for more information.
+package libusb

hidapi/mac/dummy.go

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+// +build dummy
+
+// Package c contains only a C file.
+//
+// This Go file is part of a workaround for `go mod vendor`.
+// Please see the file dummy.go at the root of the module for more information.
+package mac

hidapi/windows/dummy.go

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+// +build dummy
+
+// Package c contains only a C file.
+//
+// This Go file is part of a workaround for `go mod vendor`.
+// Please see the file dummy.go at the root of the module for more information.
+package windows

libusb/dummy.go

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+// +build dummy
+
+// Package c contains only a C file.
+//
+// This Go file is part of a workaround for `go mod vendor`.
+// Please see the file dummy.go at the root of the module for more information.
+package libusb

libusb/libusb/dummy.go

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+// +build dummy
+
+// Package c contains only a C file.
+//
+// This Go file is part of a workaround for `go mod vendor`.
+// Please see the file dummy.go at the root of the module for more information.
+package libusb

libusb/libusb/os/dummy.go

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+// +build dummy
+
+// Package c contains only a C file.
+//
+// This Go file is part of a workaround for `go mod vendor`.
+// Please see the file dummy.go at the root of the module for more information.
+package os