httpd: stop reading headers using 1-byte read()

get_line                                              73     105     +32
httpd_main                                           769     766      -3
send_cgi_and_exit                                   1583    1577      -6
send_headers                                         449     432     -17
handle_incoming_and_exit                            2217    2172     -45
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 1/4 up/down: 32/-71)            Total: -39 bytes

1 file changed