Shave off a couple of function calls in the part of
Curl_pgrsUpdate() which is always executed when called.

Fix a couple of comments.

For completeness sake, wait_ms() might also get interrupted when
experimental CURL_ACKNOWLEDGE_EINTR is defined.

or Curl_poll() with a non-zero timeout both functions would restart the
specified timeout. This could even lead to the extreme case that if a
signal arrived with a frecuency lower to the specified timeout neither
function would ever exit.

Added experimental symbol definition check CURL_ACKNOWLEDGE_EINTR in
Curl_select() and Curl_poll(). When compiled with CURL_ACKNOWLEDGE_EINTR
defined both functions will return as soon as a signal is caught. Use it
at your own risk, all calls to these functions in the library should be
revisited and checked before fully supporting this feature.

more frequently allowing same calling frecuency for the client progress
callback, while keeping the once a second frecuency for speed calculations
and internal display of the transfer progress.

Curl_poll() which is called whenever not a single valid file descriptor is
passed to these functions.

Improve readibility using a poll() macro to replace WSApoll().

it and avoid it, even if this cripples the CCC command

Added some more debug logs.

libldap when available in liblber.

multi interface

  1) the progress callback gets called more frequently (at times)
  2) libcurl *might* call the callback when it receives a signal

  machine type too.

unencrypted data connections.

in builds with HTTP support disabled to keep consistent enum values
for CURLMstate in all kind of builds.

  server through a proxy and have the remote https server port set using the
  CURLOPT_PORT option, protocol gets reset to http from https after the first
  request.

  User defined URL was modified internally by libcurl and subsequent reuse of
  the easy handle may lead to connection using a different protocol (if not
  originally http).

  I found that libcurl hardcoded the protocol to "http" when it tries to
  regenerate the URL if CURLOPT_PORT is set. I tried to fix the problem as
  follows and it's working fine so far

header line without quotes and with a CRLF immediately following...

since they're already included through "setup.h".