Fix [-Wundef] warnings in SNMP extension

Author: Girgias

ext/snmp/php_snmp.h

@@ -24,7 +24,7 @@
 
 #define PHP_SNMP_VERSION PHP_VERSION
 
-#if HAVE_SNMP
+#ifdef HAVE_SNMP
 
 #ifndef DLEXPORT
 #define DLEXPORT

ext/snmp/snmp.c

@@ -33,7 +33,7 @@
 #include "ext/spl/spl_exceptions.h"
 #include "snmp_arginfo.h"
 
-#if HAVE_SNMP
+#ifdef HAVE_SNMP
 
 #include <sys/types.h>
 #include <errno.h>
@@ -865,7 +865,7 @@ static bool netsnmp_session_init(php_snmp_session **session_p, int version, zend
 	res = psal;
 	while (n-- > 0) {
 		pptr = session->peername;
-#if HAVE_GETADDRINFO && HAVE_IPV6 && HAVE_INET_NTOP
+#if defined(HAVE_GETADDRINFO) && defined(HAVE_IPV6) && defined(HAVE_INET_NTOP)
 		if (force_ipv6 && (*res)->sa_family != AF_INET6) {
 			res++;
 			continue;