runtime: add missing nacl build tag for lock_sema.c

LGTM=dave
R=rsc, dave
CC=golang-codereviews
https://golang.org/cl/72240045

diff --git a/src/pkg/runtime/lock_sema.c b/src/pkg/runtime/lock_sema.c
index 927bf11f8457318aa3347cd14bc91a72c9e658d0..ff8fdfd42314f422f937ec0580561a381c45f22d 100644 (file)
--- a/src/pkg/runtime/lock_sema.c
+++ b/src/pkg/runtime/lock_sema.c
@@ -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 darwin netbsd openbsd plan9 solaris windows
+// +build darwin nacl netbsd openbsd plan9 solaris windows
 
 #include "runtime.h"
 #include "stack.h"