[gcc(refs/vendors/ARM/heads/arm-struct-reorg-wip)] internal/poll: add hurd build tag

[Tamar Christina]

https://gcc.gnu.org/g:a4dbb9b25a60143c699de55cd6226cebeb3b3c3e

commit a4dbb9b25a60143c699de55cd6226cebeb3b3c3e
Author: Ian Lance Taylor <iant@golang.org>
Date:   Mon Feb 24 09:27:03 2020 -0800

    internal/poll: add hurd build tag
    
    Patch from Svante Signell.
    
    Fixes GCC PR go/93900
    
    Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/220592

Diff:
---
 gcc/go/gofrontend/MERGE                 | 2 +-
 libgo/go/internal/poll/fcntl_syscall.go | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/gcc/go/gofrontend/MERGE b/gcc/go/gofrontend/MERGE
index 47fbeaeda61..7dcb9ecb4fd 100644
--- a/gcc/go/gofrontend/MERGE
+++ b/gcc/go/gofrontend/MERGE
@@ -1,4 +1,4 @@
-4e6402f3153fad368830ff3fe57c6302179de806
+658fe4f48374167bf8688e8dbd5f85eee155749e
 
 The first line of this file holds the git revision number of the last
 merge done from the gofrontend repository.
diff --git a/libgo/go/internal/poll/fcntl_syscall.go b/libgo/go/internal/poll/fcntl_syscall.go
index d232e51411a..fb82b9bd53b 100644
--- a/libgo/go/internal/poll/fcntl_syscall.go
+++ b/libgo/go/internal/poll/fcntl_syscall.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build dragonfly freebsd linux netbsd openbsd
+// +build dragonfly freebsd hurd linux netbsd openbsd
 
 package poll