tcpsvd,udpsvd: make them NOMMU-capable

tcpsvd,udpsvd: make them NOMMU-capable
inetd: make udp nowait work

function                                             old     new   delta
inetd_main                                          1797    2036    +239
tcpudpsvd_main                                      1839    1973    +134
xsetenv_plain                                          -      39     +39
xsetenv_proto                                         23      40     +17
bump_nofile                                          169     170      +1
sig_term_handler                                      72      69      -3
sig_child_handler                                    239     233      -6
connection_status                                     37      31      -6
parse_one_line                                      1102    1092     -10
------------------------------------------------------------------------------
(add/remove: 1/0 grow/shrink: 4/4 up/down: 430/-25)           Total: 405 bytes
   text    data     bss     dec     hex filename
 798437     661    7428  806526   c4e7e busybox_old
 798734     661    7428  806823   c4fa7 busybox_unstripped