Updating protos version

Change-Id: I2889e2853e1660b816e4515656cdf01f49b2900a
diff --git a/vendor/golang.org/x/sys/unix/syscall_linux_amd64.go b/vendor/golang.org/x/sys/unix/syscall_linux_amd64.go
index 8ed1d54..72efe86 100644
--- a/vendor/golang.org/x/sys/unix/syscall_linux_amd64.go
+++ b/vendor/golang.org/x/sys/unix/syscall_linux_amd64.go
@@ -6,7 +6,7 @@
 
 package unix
 
-//sys	Dup2(oldfd int, newfd int) (err error)
+//sys	dup2(oldfd int, newfd int) (err error)
 //sysnb	EpollCreate(size int) (fd int, err error)
 //sys	EpollWait(epfd int, events []EpollEvent, msec int) (n int, err error)
 //sys	Fadvise(fd int, offset int64, length int64, advice int) (err error) = SYS_FADVISE64