fixed bug #42299 tcp_abort() leaves freed pcb on tcp_bound_pcbs list
fixed bug #42117 lwip_fcntl does not set errno
minor: fixed a comment typo only
Moved #define NETDB_ELEM_SIZE from dns.h to netdb.h, where it belongs, and use sizeof() instead of hacked constants that are wrong on 64-bit platforms
netconn_gethostbyname() needs to check for name length when LWIP_MPU_COMPATIBLE==1
fixed bug #43110 (call getpeername() before listen() will cause a error) by re-sorting the error numbers and letting listen() continue on ERR_CONN
snmp: Fix a memory leak

Check the value of vbi->ident before replacing it with vbo->ident.
update CHANGELOG and fix coding style (fixed bug #39355 SNMP Memory Leak in case of error)
Merge branch 'master' of git://git.savannah.nongnu.org/lwip