re PR go/93020 (Final patches to build gcc-10 on GNU/Hurd)

	PR go/93020
    libgo: Hurd portability patches
    
    By Svante Signell.
    
    Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/212409

From-SVN: r279724

gcc/go/gofrontend/MERGE

-85641a0f26061f7c98db42a2adb3250c07ce504e
+393957c8b68e370504209eb901aa0c3874e256d4
 
 The first line of this file holds the git revision number of the last
 merge done from the gofrontend repository.

libgo/go/internal/poll/errno_unix.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 aix darwin dragonfly freebsd linux netbsd openbsd solaris
+// +build aix darwin dragonfly freebsd hurd linux netbsd openbsd solaris
 
 package poll
 

libgo/go/os/export_unix_test.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 aix darwin dragonfly freebsd js,wasm linux nacl netbsd openbsd solaris
+// +build aix darwin dragonfly freebsd hurd js,wasm linux nacl netbsd openbsd solaris
 
 package os
 

libgo/go/runtime/os_hurd.go

@@ -112,7 +112,7 @@ func semawakeup(mp *m) {
 }
 
 func getncpu() int32 {
-	n := int32(sysconf(_SC_NPROCESSORS_ONLN))
+	n := int32(sysconf(__SC_NPROCESSORS_ONLN))
 	if n < 1 {
 		return 1
 	}

libgo/go/syscall/export_unix_test.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 aix darwin dragonfly freebsd linux netbsd openbsd solaris
+// +build aix darwin dragonfly freebsd hurd linux netbsd openbsd solaris
 
 package syscall