The double name resolve trick used with c-ares could leave allocated
memory in 'temp_ai' if the operation was aborted in the middle.

When this callback is called due to the destruction of the ares handle,
the connection pointer passed in as an argument may no longer pointing
to valid data and this function doesn't need to do anything with it
anyway so we make sure it doesn't.

Bug: http://curl.haxx.se/mail/lib-2011-01/0333.html
Reported by: Vsevolod Novikov

... in case more than one CA is loaded.

Bug: https://bugzilla.redhat.com/670802

The HTTP parser allocated memory on each received Location: header
without properly freeing old data. Starting now, the code only considers
the first Location: header and will blissfully ignore subsequent ones.

Bug: http://curl.haxx.se/bug/view.cgi?id=3165129
Reported by: Martin Lemke

Testing Curl_llist_insert_next

... to not make the connection between the tool and the libcurl used
tighter than necessary, the tlsauth options are now always present but
if the used libcurl doesn't have TLSAUTH support it will return failure.

Also, replaced strncmp() with strequal to get case insensitive matching.

Test case 1014 failed since TLS-SRP was correctly set to the features
variable so curl-config --features didn't output it.

The default value is 1.

curl _uses_ a default CA bundle, it doesn't install one.

Drop the references to 7.10 as that is now >8 years old!

Extended the intial HTTP protcol part and added a mention of --trace and
--trace-ascii.

Replaced most URLs in the text to use example.com instead of all the
made up strange names.

Shortened a bunch of lines.

Extended the descriptions somewhat and made the options get listed next
to each other.

Submitted by Vincent Torri.

... and update the curl.1 and curl_easy_setopt.3 man pages such that
they do not suggest to use an OpenSSL utility if curl is not built
against OpenSSL.

Bug: https://bugzilla.redhat.com/669702

Bug: http://curl.haxx.se/bug/view.cgi?id=3157232
Reported by: John Bradshaw

Get rid of stdout redirection to NUL and move stderr redirection
into RM and RMDIR macros.

Check for BCCDIR environment var done now as other checks.

Borland's $(MAKEDIR) expands to the path where make.exe is located,
use this feature to define BCCDIR when user has not defined BCCDIR.