gc: include signal.h (fix build)

R=ken2
CC=golang-dev
https://golang.org/cl/1871049

diff --git a/src/cmd/gc/go.h b/src/cmd/gc/go.h
index 8417872f408326b858e5ff4ce7523b8f506976e1..96fce565ef99cfc173ce5355e0fbf99440a36249 100644 (file)
--- a/src/cmd/gc/go.h
+++ b/src/cmd/gc/go.h
@@ -3,6 +3,7 @@
 // license that can be found in the LICENSE file.
 
 #include       <u.h>
+#include       <signal.h>
 #include       <libc.h>
 #include       <bio.h>