syscall: add missing include statement to bootstrap error code and signal generator

LGTM=iant
R=golang-codereviews, iant
CC=golang-codereviews
https://golang.org/cl/54300054

diff --git a/src/pkg/syscall/mkerrors.sh b/src/pkg/syscall/mkerrors.sh
index d60d1be97a3e84347d7872ebdb75079c0731df1d..498e42de422a1314ffa7a4f14c3824216cd94c44 100755 (executable)
--- a/src/pkg/syscall/mkerrors.sh
+++ b/src/pkg/syscall/mkerrors.sh
@@ -306,6 +306,7 @@ echo ')'
 (
        /bin/echo "
 #include <stdio.h>
+#include <stdlib.h>
 #include <errno.h>
 #include <ctype.h>
 #include <string.h>