Block signals explicitly during lwp creation since blocking via the context

doea not work.

lang/go/Makefile

@@ -1,9 +1,10 @@
-# $NetBSD: Makefile,v 1.49 2017/03/15 19:38:09 bsiegert Exp $
+# $NetBSD: Makefile,v 1.50 2017/04/19 21:27:31 christos Exp $
 
 .include "version.mk"
 
 DISTNAME=	go${GO_VERSION}.src
 PKGNAME=	go-${GO_VERSION}
+PKGREVISION=	1
 CATEGORIES=	lang
 MASTER_SITES=	https://storage.googleapis.com/golang/
 

lang/go/distinfo

@@ -1,4 +1,4 @@
-$NetBSD: distinfo,v 1.45 2017/04/09 08:23:43 wen Exp $
+$NetBSD: distinfo,v 1.46 2017/04/19 21:27:31 christos Exp $
 
 SHA1 (go1.8.1.src.tar.gz) = 0c4b7116bd6b7cdc19bdcf8336c75eae4620907b
 RMD160 (go1.8.1.src.tar.gz) = c0251b667a9c34f9dd180aeb8c4c9dce5832b9eb
@@ -7,4 +7,5 @@ Size (go1.8.1.src.tar.gz) = 15331455 bytes
 SHA1 (patch-lib_time_update.bash) = bcf565b97ae7898a9e5cef7686fe42c69bc0bba1
 SHA1 (patch-misc_io_clangwrap.sh) = cd91c47ba0fe7b6eb8009dd261c0c26c7d581c29
 SHA1 (patch-src_crypto_x509_root__bsd.go) = 0eca1eafa967268ae9b224be4aeda347ebc91901
+SHA1 (patch-src_runtime_os__netbsd.go) = 561f53c084c5bff93171a411bebd79bebf1e3696
 SHA1 (patch-src_syscall_syscall__solaris.go) = 436371947897dcba574a6dfecc6bbcd04f6e25b2

lang/go/patches/patch-src_runtime_os__netbsd.go

@@ -0,0 +1,28 @@
+# $NetBSD: patch-src_runtime_os__netbsd.go,v 1.1 2017/04/19 21:27:31 christos Exp $
+
+--- src/runtime/os_netbsd.go.orig	2017-04-07 12:54:08.000000000 -0400
++++ src/runtime/os_netbsd.go	2017-04-19 17:08:10.806553689 -0400
+@@ -167,13 +167,23 @@
+ 	var uc ucontextt
+ 	getcontext(unsafe.Pointer(&uc))
+ 
++	// XXX: _UC_SIGMASK does not seem to work here.
++	// It would be nice if _UC_SIGMASK and _UC_STACK
++	// worked so that we could do all the work setting
++	// the sigmask and the stack here, instead of setting
++	// the mask here and the stack in netbsdMstart
++	// For now do the blocking manually.
+ 	uc.uc_flags = _UC_SIGMASK | _UC_CPU
+ 	uc.uc_link = nil
+ 	uc.uc_sigmask = sigset_all
+ 
++	var oset sigset
++	sigprocmask(_SIG_SETMASK, &sigset_all, &oset)
++
+ 	lwp_mcontext_init(&uc.uc_mcontext, stk, mp, mp.g0, funcPC(netbsdMstart))
+ 
+ 	ret := lwp_create(unsafe.Pointer(&uc), 0, unsafe.Pointer(&mp.procid))
++	sigprocmask(_SIG_SETMASK, &oset, nil)
+ 	if ret < 0 {
+ 		print("runtime: failed to create new OS thread (have ", mcount()-1, " already; errno=", -ret, ")\n")
+ 		if ret == -_EAGAIN {