are sorted out.

cache, we must make sure not to derefence the NULL pointer...
CID 6 coverity.com scan

have not been properly defined to allow this! Instead of changing the defines
and break the ABI/API, I opted to modify the code to check for exact type
matches.
CID 10 coverity.com scan

happen when curl_multi_remove_handle() is called.
CID 13. coverity.com scan

anyway and we can just as well rely on it being valid.
CID 12, coverity.com scan

Try to avoid this problem checking for some possible unsupported options,
and avoid using them in the configuration file.

Removed the NULL check since the pointer must be valid already.

unnecessary - found by coverity.com scan

in the PATH and afterwards in other common locations.

and added tests 290 and 291 to check.

Enable libssh2 tracing when ssh debugging is turned on.

to complete with no delay and actually find out what happened with
the socket. As well as detection of socket send()able condition.

This also allows removal of a Cygwin specific block of code.

uses poll() when a fine poll() is available, so now libcurl can be
built without select() support at all if a fine poll() is available.

and/or HAVE_VARIADIC_MACROS_GCC for specific compiler versions that support
variadic macros with C99 style and/or old gcc style in their specific config.h
file.

If previous definitions are not done, even when aplicable, and --disable-verbose
is used, the fallback (void) method will be used to define infof, avoiding the
inclusion of unwanted strings in the resulting library/executable.