response reading function

make this better on more systems.

utility

be backwards compatible with older libcurls just fine.

NOTE that this breaks ares-compatibility, we have now officially taken the
turn into the c-ares path. We will now officially depend on c-ares for asynch
name resolves.

This breaks the API and ABI with the existing ares library. We hereby require
the upcoming c-ares 1.0 for asynch name resolves!

as well, and when failing and not getting a timeout we now include the
error message ares can provide us with.

this allows the HTTP code to *not* return a failure just because no data
has been received from the server

Dirk Manske, but modified by me.

the search path since we want the build-version rather than the one in the
source dir

Vanem

header using -H

so that the automatic testing hosts will test these changes over the weekend.

the dump file to make it easier to understand and debug the situation