file: URLs only.

-Log errno in message if setsockopt() fails.

-Close listener socket on major errors.

we did wrong and patched it: When nodes were removed from the splay tree,
and we didn't properly remove it from the splay tree when an easy handle was
removed from a multi stack and thus we could wrongly leave a node in the
splay tree pointing to (bad) memory.

tests/libtest/lib506.c version 1.11 is now also logging CURLSHOPT_LOCKFUNC, CURLSHOPT_UNLOCKFUNC and CURLSHOPT_USERDATA, so we now also have to check them here.

for FTP ASCII transfers.

Change to meaningful var names and take care of a compiler warning on IRIX 6.5.22 MIPSPro C 7.3 64bit

Place parenthesis surrounding macro parameters so that the use of sread and swrite is more intuitive.

Define NEED_MALLOC_H if including <stdlib.h> is not enough for proper compilation and <malloc.h> must also be included.