Add debug tracing for CURL_CHECK_DEF_INTXX_C.

155 - bug #2038004 "Curl OpenSSL not compatible with 7.17 or 7.18"

156 - proxy CONNECT issue (details not public yet due to possible security impact)

in curlbuild.h as CURL_SIZEOF_LONG. Definition now done from configure process
and in CVS curlbuild.h.dist for non-configure systems.

belong among the release numbers anyway

header replacing an internal one

when a server responded with long headers and data.  Luckily, the buffer
overflowed into another unused buffer, so no actual harm was done.
Added test cases 1060 and 1061 to verify.

  _directory_ if that happened to appear in the path!

constants CURL_OFF_T_C and CURL_OFF_TU_C. The clever double helper macro
used internally to provide its functionality is thanks to Lars Nilsson.

line of a multiline FTP response whose last byte landed exactly at the end
of the BUFSIZE-length buffer would be treated as the terminal response
line.  The following response code read in would then actually be the
end of the previous response line, and all responses from then on would
correspond to the wrong command. Test case 1062 verifies this.

Stop closing a never-opened ftp socket.

  (http://curl.haxx.se/bug/view.cgi?id=2042430) with a patch. "NTLM Windows
  SSPI code is not thread safe". This was due to libcurl using static
  variables to tell wether to load the necessary SSPI DLL, but now the loading
  has been moved to the more suitable curl_global_init() call.

  (http://curl.haxx.se/bug/view.cgi?id=2042440) with a patch. He identified a
  problem when using NTLM over a proxy but the end-point does Basic, and then
  libcurl would do wrong when the host sent "Connection: close" as the proxy's
  NTLM state was erroneously cleared.

internal and external use. CURL_SUFFIX_CURL_OFF_T, CURL_SUFFIX_CURL_OFF_TU.

has to be revisited and adjusted as appropriate.

Enabling and disabling of large file support needs further inspection.