adds vendor directory

vendors dependencies in standard `vendor` directory, managed by glide

vendor/github.com/mattn/go-gtk/gdk/gdk.go.h

@@ -0,0 +1,23 @@
+#ifndef GO_GDK_H
+#define GO_GDK_H
+
+#include <gdk/gdk.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <stdarg.h>
+#include <string.h>
+
+static gchar* toGstr(char* s) { return (gchar*)s; }
+
+static void freeCstr(char* s) { free(s); }
+
+static GdkWindow* toGdkWindow(void* w) { return GDK_WINDOW(w); }
+static GdkDragContext* toGdkDragContext(void* l) { return (GdkDragContext*)l; }
+static GdkFont* toGdkFont(void* l) { return (GdkFont*)l; }
+
+static void* _gdk_display_get_default() {
+	return (void*) gdk_display_get_default();
+}
+
+#endif

vendor/github.com/mattn/go-gtk/gdk/gdk_freebsd.go

@@ -0,0 +1 @@
+gdk_linux.go

vendor/github.com/mattn/go-gtk/gdk/gdk_linux.go

@@ -0,0 +1,15 @@
+// +build !cgocheck
+
+package gdk
+
+/*
+#include <gdk/gdk.h>
+#include <gdk/gdkx.h>
+// #cgo pkg-config: gdk-2.0 gthread-2.0
+*/
+import "C"
+import "unsafe"
+
+func (v *Window) GetNativeWindowID() int32 {
+	return int32(C.gdk_x11_drawable_get_xid((*C.GdkDrawable)(unsafe.Pointer(v.GWindow))))
+}

vendor/github.com/mattn/go-gtk/gdk/gdk_quartz_darwin.go

@@ -0,0 +1,33 @@
+// +build !with-x11
+
+package gdk
+
+/*
+#cgo pkg-config: gdk-2.0 gthread-2.0
+#cgo CFLAGS: -x objective-c
+
+#include <gdk/gdk.h>
+#include <gdk/gdkquartz.h>
+
+// Must return void* to avoid "struct size calculation error off=8 bytesize=0"
+// See:
+// - https://github.com/golang/go/issues/12065
+// - http://thread0.me/2015/07/gogoa-cocoa-bindings-for-go/
+void* getNsWindow(GdkWindow *w) {
+	return (void*) gdk_quartz_window_get_nswindow(w);
+}
+
+*/
+import "C"
+
+import "unsafe"
+
+type NSWindow struct {
+	ID unsafe.Pointer
+}
+
+func (v *Window) GetNativeWindow() *NSWindow {
+	return &NSWindow{
+		unsafe.Pointer(C.getNsWindow(v.GWindow)),
+	}
+}

vendor/github.com/mattn/go-gtk/gdk/gdk_windows.go

@@ -0,0 +1,15 @@
+// +build !cgocheck
+
+package gdk
+
+/*
+#include <gdk/gdk.h>
+#include <gdk/gdkwin32.h>
+// #cgo pkg-config: gdk-2.0 gthread-2.0
+*/
+import "C"
+import "unsafe"
+
+func (v *Window) GetNativeWindowID() int32 {
+	return int32(uintptr(unsafe.Pointer(C.gdk_win32_drawable_get_handle((*C.GdkDrawable)(unsafe.Pointer(v.GWindow))))))
+}

vendor/github.com/mattn/go-gtk/gdk/gdk_x11_darwin.go

@@ -0,0 +1,16 @@
+// +build with-x11
+
+package gdk
+
+/*
+#cgo pkg-config: gdk-2.0 gthread-2.0
+
+#include <gdk/gdk.h>
+#include <gdk/gdkx.h>
+*/
+import "C"
+import "unsafe"
+
+func (v *Window) GetNativeWindowID() int32 {
+	return int32(C.gdk_x11_drawable_get_xid((*C.GdkDrawable)(unsafe.Pointer(v.GWindow))))
+}