res/res_resolver_unbound.c: Add missing include of signal.h

ASTERISK-25110 #close
Reported by: John Bigelow

Change-Id: I99a9d93f066f265357b647b8e99a75e45da5a39f

diff --git a/res/res_resolver_unbound.c b/res/res_resolver_unbound.c
index 436a8ee..a4e86a6 100644 (file)
--- a/res/res_resolver_unbound.c
+++ b/res/res_resolver_unbound.c
@@ -25,6 +25,7 @@
 
 ASTERISK_REGISTER_FILE()
 
+#include <signal.h>
 #include <unbound.h>
 #include <arpa/nameser.h>