influxdbc: support for FreeBSD build

(cherry picked from commit abcafe75de7adc524b4a5a3df103f427565f9627)

src/modules/influxdbc/ic.c

@@ -26,6 +26,7 @@
 #include <string.h>
 #include <sys/errno.h>
 #include <sys/socket.h>
+#include <netinet/in.h>
 #include <arpa/inet.h>
 #include <netdb.h>