fixed bug #38219 Assert on TCP netconn_write with sndtimeout set
Merge branch 'master' of git.sv.gnu.org:/srv/git/lwip
fixed comment (bug #43481 MEMP_SYS_TIMEOUTS is not for NO_SYS=0 only)
fixed bugs #41495 Possible threading issue in select() and #43278
    event_callback() handle context switch when calling sys_sem_signal()
fixed cosmetic bug #43499: wrong argument order in src/include/netif/etharp.h defines
SNMP: added missing casts to int for printf arguments
lwip_socket_init() is not needed any more -> compatibility define
CHANGELOG: fixed date
Fixed multiple smaller compiler warnings
mem.h: fixed constants to be unsinged to fix compiler warning
slightly improved compiler warning fixes
use u32_t instead of u_int32_t

The style u_int32_t is not used anywhere else in the project, and is not
supported by the C standard, now using lwIP u32_t type. It was introduced
in 25e398a.
Merge branch 'master' of git://git.savannah.nongnu.org/lwip
Merge branch 'master' of github.com:tabascoeye/lwip