readded some includes to make it build on openbsd

src/common.c

@@ -15,6 +15,7 @@
 
 #include <arpa/inet.h>
 #include <arpa/nameser.h>
+#include <netinet/in.h>
 #ifdef DARWIN
 #include <arpa/nameser8_compat.h>
 #endif

src/common.h

@@ -17,6 +17,9 @@
 #ifndef __COMMON_H__
 #define __COMMON_H__
 
+#include <sys/types.h>
+#include <sys/socket.h>
+
 #ifndef MIN
 #define MIN(a,b) ((a)<(b)?(a):(b))
 #endif