LWIP_POSIX_SOCKETS_IO_NAMES macro

LWIP_POSIX_SOCKETS_IO_NAMES==1: Enable POSIX-style sockets functions names. Disable this option if you use a POSIX operating system that uses the same names (read, write & close). (only used if you use sockets.c) POSIX I/O functions are mapped to LWIP via the VFS layer (see port/vfs_lwip.c)