fix compile error on xBSD

Author: zocker007

src/os-freebsd.h

@@ -19,6 +19,10 @@
 
 #define INADDR_ALLIGMPV3_GROUP ((in_addr_t) 0xe0000016)
 
+#ifndef LOGIN_NAME_MAX
+#define LOGIN_NAME_MAX 256
+#endif
+
 static inline unsigned short ip_data_len(const struct ip *ip)
 {
 #if __FreeBSD_version >= 1100030

src/os-openbsd.h

@@ -12,6 +12,10 @@
 #define INADDR_ALLRTRS_GROUP INADDR_ALLROUTERS_GROUP
 #define INADDR_ALLIGMPV3_GROUP ((in_addr_t) 0xe0000016)
 
+#ifndef LOGIN_NAME_MAX
+#define LOGIN_NAME_MAX 256
+#endif
+
 static inline unsigned short ip_data_len(const struct ip *ip)
 {
     return ntohs(ip->ip_len) - (ip->ip_hl << 2);