Conditional compilation of localnetwork matching

Some architectures (esp32) might not have this API.

Fixes: #263

Signed-off-by: Jakub Jelen <jjelen@redhat.com>
Reviewed-by: Andreas Schneider <asn@cryptomilk.org>
(cherry picked from commit 9634668258)

tests/unittests/torture_config_match_localnetwork.c

@@ -3,7 +3,9 @@
 #include "libssh/options.h"
 #include "libssh/session.h"
 #include "match.c"
+#ifdef HAVE_IFADDRS_H
 #include <ifaddrs.h>
+#endif
 #include <net/if.h>
 #include <stdbool.h>