Closes #1653

Removes BUILD_RELEASE_DEBUG_DIRS since it wasn't used anywhere.

Closes #1649

Add a basic telnet server for negotiating some telnet options before
echoing back any data that's sent to it.

Closes #1645

I added a selection of torture and event tests that run "fast enough"

Fixes #1612
Reported-by: Jeroen Ooms

Bug: https://github.com/curl/curl/issues/828#issuecomment-313475151

Fixes #1552

... to let tests require it or skip if present

Make the name reflect its use better, and add a short comment describing
what it's for.

... and make sure inet_pton is always checked for when *not* using Windows,
which is a regression from 4fc6ebe1.

Idea-by: Sergei Nikulov

... by checking the POLLIN define, as the header file checks don't work
on Windows.

inet_pton() exists on Windows and gets used by our cmake builds. Make
sure the correct header file is included to avoid compiler warnings.

Closes #1639

Closes #1572

... by simply trying the Windows argument types first.

Fixes #1640

Bug: https://curl.haxx.se/mail/lib-2017-07/0005.html

Closes #1643

Closes #1642

bug: https://curl.haxx.se/mail/lib-2017-07/0005.html

When scanning for which LDAP libraries to use, try the -lldap -llber
combination before the reversed order since it has a greater chance of
working when linking with libcurl statically.

Fixes #1619
Closes #1634
Reported-by: David E. Narváez

fork, getprotobyname, inet_addr, perror, uname

closes #1638

Add test 1451 which does some very basic SMB testing using the impacket
SMB server.

Closes #1630

Import impacket 0.9.15 for use in SMB testing. This was generated by
doing "pip2.7 install -t . impacket"

Unnecessary files for current testing were deleted.

... to better detect and fault on compiler warnings/errors

Closes #1637

tool_sleep.c:54:24: error: implicit conversion loses integer precision:
'long' to '__darwin_suseconds_t' (aka 'int')
[-Werror,-Wshorten-64-to-32]

On a 64 bit host, sparse says:

timeval.c:148:15: warning: constant 0x7fffffffffffffff is so big it is long
timeval.c:149:12: warning: constant 0x7fffffffffffffff is so big it is long

so let's use long long constant types in order to prevent undesired overflow
failures.

Bug: https://curl.haxx.se/mail/lib-2017-07/0003.html



Closes #1636

Signed-off-by: Martin Kepplinger <martink@posteo.de>

... since CURLOPT_URL should follow the same rules as other options:
they remain set until changed or cleared.

Added test 1551 to verify.

Fixes #1631
Closes #1632
Reported-by: Pavel Rochnyak

- Change gnutls pointer/int macros to pointer/curl_socket_t.
  Prior to this change they used long type as well.

The size of the `long` data type can be shorter than that of pointer
types. This is the case most notably on Windows.

If C99 were acceptable, we could simply use `intptr_t` here. But we
want to retain C89 compatibility.

Simply use the trick of performing pointer arithmetic with the NULL
pointer: to convert an integer `i` to a pointer, simply take the
address of the `i`th element of a hypothetical character array
starting at address NULL. To convert back, simply cast the pointer
difference.

Thanks to Jay Satiro for the initial modification to use curl_socket_t
instead of int/long.

Closes #1617

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

Bug: #1616
Closes #1633

CURL_STATIC_CRT and ENABLE_INET_PTON

Closes #1621