[PATCH] - Take 2: Adds support for custom error pages in httpd

[Pierre Métras]

Hi,

As recommended by Walter Harms, this version of the patch uses xasprintf() 
instead of malloc()/strcpy()/strcat(). The final size of the binary is even 
smaller: 324 bytes instead of 388 bytes with the previous patch.

make bloatcheck
function                                             old     new   delta
parse_conf                                          1201    1372    +171
sendHeaders                                          461     571    +110
sendFile                                             252     317     +65
httpResponseNames                                    108     144     +36
handleIncoming                                      2032    2038      +6
.rodata                                           138727  138663     -64
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 5/1 up/down: 388/-64)           Total: 324 bytes
   text    data     bss     dec     hex filename
 636180    3124   12800  652104   9f348 busybox_old
 636525    3288   12800  652613   9f545 busybox_unstripped

-- Pierre Métras
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