Allow repeatable file name length reduction on file names with underscore or
dash characters. This is done in order to better support libcurl's existing
source file names and allow OS/400 package to build out of the box again.

configure script now provides conditional definitions for Makefile.am
that result in CURL_HIDDEN_SYMBOLS being defined by resulting makefiles
when appropriate.

Additionally, configure script option for symbol hiding control is now
named --enable-symbol-hiding --disable-symbol-hiding. While still valid,
old option name --enable-hidden-symbols --disable-hidden-symbols will
be deprecated in some future release.

Undefining CURL_HIDDEN_SYMBOLS in source files isn't the proper fix.

Undefine CURL_HIDDEN_SYMBOLS libcurl private preprocessor macro that might
leak from lib/setup.h into source files where this should not be defined.

Undefine CURL_HIDDEN_SYMBOLS libcurl private preprocessor macro that might
leak from lib/setup.h into source files where this should not be defined.

lib/config-win32.h no longer copied to src/config-win32.h

BUILDING_LIBCURL and CURL_STATICLIB are no longer defined in curl_config.h,
configure will generate appropriate conditionals so that mentioned symbols
get defined and used in Makefiles at compilation time

amigaos.[ch] now integrates nicely with any libcurl build

Configuration files such as curl_config.h and all config-*.h no longer exist
nor are generated/copied into 'src' directory, now these only exist in 'lib'
directory from where curl tool sources uses them.

Additionally old src/setup.h has been refactored into src/tool_setup.h which
now pulls lib/setup.h

The possibility of a makefile needing an include path adjustment exists.

When a server certificate matches one in the given CRL file, the code
now returns CURLE_SSL_CACERT as test case 313 expects and verifies.

Previously it would say PolarSSL only, now it says PolarSSL/1.1.0 in the
same style other libs and components do.

As it turns out, some people do want that after all.

Verify that cookies are sent back even after a 407 response has been
received

This reverts commit f7e2ab62.

This change caused fetching of the certificates to become unreliable.

Bug: http://curl.haxx.se/mail/lib-2012-03/0238.html
Reported by: Tim Heckman

Commit 97b66ebe was copying a smaller buffer, thus duplicating the last
character.

... as it seems to hard for some people

Don't set the "has_openssl" variable if yassl or polarssl is found as
they will simply not work as 100% drop-in replacements for some of the
stuff the "OpenSSL" feature is used for.

I spotted this problem when doing test runs with PolarSSL builds.

Curl_socket returns CURLE_COULDNT_CONNECT when the opensocket callback
returns CURL_SOCKET_BAD. Previous return value CURLE_FAILED_INIT
conveys incorrect information to the user.

Reworked the command sending from two specific LIST and RETR command
functions into a single command based function as well as the two
associated response handlers into a generic command handler.

By modifying the parameter list for ourWriteOut() and passing the
OutStruct that collects data in tool_operate, we get access to the
remote name that we're writing to. Shell scripters should find this
useful when used in conjuntion with the --remote-header-name option.

If an empty string is passed to CURLOPT_SSH_PUBLIC_KEYFILE, libcurl will
pass no public key to libssh2 which then tries to compute it from the
private key. This is known to work when libssh2 1.4.0+ is linked against
OpenSSL.