Ensure that there isn't a mismatch between setlocal and endlocal calls,
which could have happened due to setlocal being called after certain
error conditions were checked for.

Allow the -help command line argument to be specified in any argument
and not just as the first.

closes #366

...as well as a TODO for a future enhancement to the project files.

Thanks-to: Jay Satiro

URL: https://github.com/bagder/curl/pull/174

Added the wolfSSL build script, based on build-openssl.bat, as well as
the property sheet and header file required for the upcoming additions
to the Visual Studio project files.

Suggested-by: mc0e

Currently when the server responds with 401 on NTLM authenticated
connection (re-used) we consider it to have failed.  However this is
legitimate and may happen when for example IIS is set configured to
'authPersistSingleRequest' or when the request goes thru a proxy (with
'via' header).

Implemented by imploying an additional state once a connection is
re-used to indicate that if we receive 401 we need to restart
authentication.

Closes #363

Closes #361

The SSH state machine didn't clear the 'rc' variable appropriately in a
two places which prevented it from looping the way it should. And it
lacked an 'else' statement that made it possible to erroneously get
stuck in the SSH_AUTH_AGENT state.

Reported-by: Tim Stack

Closes #357

initialization discards 'const' qualifier from pointer target type

Closes #360

References to NTLM in the identity generation should have been removed
in commit c4699412 but not all were.

connect.c:953:5: warning: initializer element is not computable at load
                 time
connect.c:953:5: warning: missing initializer for field 'dwMinorVersion'
                 of 'OSVERSIONINFOEX'
curl_sspi.c:97:5: warning: initializer element is not computable at load
                  time
curl_sspi.c:97:5: warning: missing initializer for field 'szCSDVersion'
                  of 'OSVERSIONINFOEX'

schannel.c:1125:5: warning: missing initializer for field 'dwMinorVersion'
                   of 'OSVERSIONINFOEX' [-Wmissing-field-initializers

Bug: http://curl.haxx.se/mail/lib-2015-07/0149.html
Reported-by: Eric Ridge

Bug: http://curl.haxx.se/mail/lib-2015-07/0149.html
Reported-by: Eric Ridge

...as well as some rewording.

Otherwise it would never be called for an HTTP/2 connection, which has
its own disconnect handler.

I spotted this while debugging <https://bugzilla.redhat.com/1248389>
where the http_disconnect() handler was called on an FTP session handle
causing 'dnf' to crash.  conn->data->req.protop of type (struct FTP *)
was reinterpreted as type (struct HTTP *) which resulted in SIGSEGV in
Curl_add_buffer_free() after printing the "Connection cache is full,
closing the oldest one." message.

A previously working version of libcurl started to crash after it was
recompiled with the HTTP/2 support despite the HTTP/2 protocol was not
actually used.  This commit makes it work again although I suspect the
root cause (reinterpreting session handle data of incompatible protocol)
still has to be fixed.  Otherwise the same will happen when mixing FTP
and HTTP/2 connections and exceeding the connection cache limit.

Reported-by: Tomas Tomecek
Bug: https://bugzilla.redhat.com/1248389