Remove use of AI_ADDRCONFIG.

Closes #869, #901.

Thanks to Alex Richman.

Signed-off-by: Roger A. Light <roger@atchoo.org>

ChangeLog.txt

@@ -6,6 +6,8 @@ Broker:
   Closes #900.
 - Print more OpenSSL errors when loading certificates/keys fail.
 - Use AF_UNSPEC etc. instead of PF_UNSPEC to comply with POSIX. Closes #863.
+- Remove use of AI_ADDRCONFIG, which means the broker can be used on systems
+  where only the loopback interface is defined. Closes #869, Closes #901.
 
 
 1.5 - 20180502

lib/net_mosq.c

@@ -46,9 +46,6 @@ Contributors:
 #endif
 
 #ifdef __QNX__
-#ifndef AI_ADDRCONFIG
-#define AI_ADDRCONFIG 0
-#endif
 #include <net/netbyte.h>
 #include <netinet/in.h>
 #endif
@@ -311,7 +308,6 @@ int net__try_connect(struct mosquitto *mosq, const char *host, uint16_t port, mo
 	*sock = INVALID_SOCKET;
 	memset(&hints, 0, sizeof(struct addrinfo));
 	hints.ai_family = AF_UNSPEC;
-	hints.ai_flags = AI_ADDRCONFIG;
 	hints.ai_socktype = SOCK_STREAM;
 
 	s = getaddrinfo(host, NULL, &hints, &ainfo);

src/conf.c

@@ -115,7 +115,6 @@ static int conf__attempt_resolve(const char *host, const char *text, int log, co
 
 	memset(&gai_hints, 0, sizeof(struct addrinfo));
 	gai_hints.ai_family = AF_UNSPEC;
-	gai_hints.ai_flags = AI_ADDRCONFIG;
 	gai_hints.ai_socktype = SOCK_STREAM;
 	gai_res = NULL;
 	rc = getaddrinfo(host, NULL, &gai_hints, &gai_res);