runtime: define NSIG to fix plan 9 build

R=rsc
CC=golang-dev
https://golang.org/cl/5677053

diff --git a/src/pkg/runtime/os_plan9.h b/src/pkg/runtime/os_plan9.h
index b7b83834949d37010435d95fe3718aceced852a0..cc6343c8ec47bb14e6442b2711133f74e4d8f733 100644 (file)
--- a/src/pkg/runtime/os_plan9.h
+++ b/src/pkg/runtime/os_plan9.h
@@ -66,3 +66,4 @@ struct Tos {
        /* top of stack is here */
 };
 
+#define        NSIG 1