[Minor] Try to fix endiannes detection on Solaris

Issue: #2204

config.h.in

@@ -158,6 +158,12 @@
  #include <machine/endian.h>
 #elif defined(__sun)
  #include <sys/byteorder.h>
+ #ifndef LITTLE_ENDIAN
+ #define LITTLE_ENDIAN   1234
+ #endif
+ #ifndef BIG_ENDIAN
+ #define BIG_ENDIAN      4321
+ #endif
  #ifdef _LITTLE_ENDIAN
   #define BYTE_ORDER LITTLE_ENDIAN
  #else

contrib/librdns/dns_private.h

@@ -24,6 +24,7 @@
 #ifndef DNS_PRIVATE_H_
 #define DNS_PRIVATE_H_
 
+#include "config.h"
 #include "uthash.h"
 #include "utlist.h"
 #include "rdns.h"