configure made libcurl use blocking sockets on AIX 4 and 5, while that
wasn't the intention.

when using the socket API

of a socket after it has been closed, when the FTP-SSL data connection is taken
down.

support for the OS/400 Secure Sockets Layer library

some few internal identifiers to avoid conflicts, which could be useful on
other platforms.

to occur in a couple of tests.

verifies the bug fix in #1757328.

from the test server code as they served no real purpose. The test server is
here to serve for the test cases, not to attempt to function as a real server!

lower case for consistency since sftp commands are case insensitive.

(http://curl.haxx.se/bug/view.cgi?id=1757328) and submitted a patch. It turns
out we broke login to FTP servers that don't require (nor understand) PASS
after the USER command

keys that small.

issue is in libssh2 and not freeing a dynamic error message during cleanup.