vendor: add missing deps and remove go get in .travis.yml

Signed-off-by: Akihiro Suda <suda.akihiro@lab.ntt.co.jp>

vendor/github.com/nightlyone/lockfile/lockfile_windows.go

@@ -0,0 +1,30 @@
+package lockfile
+
+import (
+	"syscall"
+)
+
+//For some reason these consts don't exist in syscall.
+const (
+	error_invalid_parameter = 87
+	code_still_active       = 259
+)
+
+func isRunning(pid int) (bool, error) {
+	procHnd, err := syscall.OpenProcess(syscall.PROCESS_QUERY_INFORMATION, true, uint32(pid))
+	if err != nil {
+		if scerr, ok := err.(syscall.Errno); ok {
+			if uintptr(scerr) == error_invalid_parameter {
+				return false, nil
+			}
+		}
+	}
+
+	var code uint32
+	err = syscall.GetExitCodeProcess(procHnd, &code)
+	if err != nil {
+		return false, err
+	}
+
+	return code == code_still_active, nil
+}