This patches add compatibility for the forthcoming RobotFramework 5.

Taken from: https://github.com/robotframework/SSHLibrary/pull/403.
diff --git a/src/SSHLibrary/pythonforward.py b/src/SSHLibrary/pythonforward.py
index 8b85997b7..607985cf4 100644
--- a/src/SSHLibrary/pythonforward.py
+++ b/src/SSHLibrary/pythonforward.py
@@ -1,9 +1,9 @@
 import select
 import socket
 import threading
-from robot.utils import platform
+from robot.utils import PY2, WINDOWS
 from .logger import logger
-if platform.PY2 and platform.WINDOWS:
+if PY2 and WINDOWS:
     import win_inet_pton
 try:
     import SocketServer
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<div class='path'>path: <a href='/guix/log/?id=d15e4b1dc25000ba0ec5ae28cd5ea73c7d0ad1c5'>root</a>/<a href='/guix/log/NEWS?id=d15e4b1dc25000ba0ec5ae28cd5ea73c7d0ad1c5'>NEWS</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/NEWS?id=d15e4b1dc25000ba0ec5ae28cd5ea73c7d0ad1c5&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2019-05-17 11:25:51 +0200'>2019-05-17</span></td><td><a href='/guix/commit/NEWS?id=c34684b6bc32c76b2383cf3641dad1b059fd84fc'>Update NEWS.</a></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-05-16 18:52:27 +0200'>2019-05-16</span></td><td><a href='/guix/commit/NEWS?id=22872f766615ed5ae300b6bc1212e3001f46a0e9'>Update NEWS.</a></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-05-01 12:10:42 +0200'>2019-05-01</span></td><td><a href='/guix/commit/NEWS?id=6298c3ffd9654d3231a6f25390b056483e8f407c'>Update NEWS.</a></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-04-29 11:31:23 +0200'>2019-04-29</span></td><td><a href='/guix/commit/NEWS?id=2f8198dfed1de935dfc60510a5514e5c289c3fc7'>Update NEWS.</a></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-04-28 22:57:07 +0200'>2019-04-28</span></td><td><a href='/guix/commit/NEWS?id=7dac61143d9911ad02e239a44b17bd40f06d47a6'>Update NEWS.</a></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2018-12-05 00:11:22 +0100'>2018-12-05</span></td><td><a href='/guix/commit/NEWS?id=eeedb094ec93ac63e92f733165a3e6883f6002ba'>Update NEWS.</a></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2018-12-05 00:08:28 +0100'>2018-12-05</span></td><td><a href='/guix/commit/NEWS?id=273cce9875a1deba2b6669099e69824db55c9622'>Update NEWS.</a></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2018-11-23 15:42:01 +0100'>2018-11-23</span></td><td><a href='/guix/commit/NEWS?id=4bd5b9707e14bd5ad4da6868687ff3c642705ce3'>Update NEWS.</a></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2018-08-30 15:22:30 +0200'>2018-08-30</span></td><td><a href='/guix/commit/NEWS?id=0f377aad75314df6c6296f4172801519315d81cd'>Update NEWS.</a></td><td>Ricardo Wurmus</td></tr>
<tr><td><span title='2018-07-05 22:16:39 +0200'>2018-07-05</span></td><td><a href='/guix/commit/NEWS?id=359fdda40f754bbf1b5dc261e7427b75463b59be'>Update NEWS.</a></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2018-07-05 17:19:09 +0200'>2018-07-05</span></td><td><a href='/guix/commit/NEWS?id=1400776f529317c6c3529a0fda2b728e48a621a2'>Update NEWS.</a></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2018-06-20 23:47:08 +0200'>2018-06-20</span></td><td><a href='/guix/commit/NEWS?id=414ee4edc9e6fcadba366072a7ebabf3e3c6f26a'>Update NEWS.</a></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2018-05-29 14:05:11 +0200'>2018-05-29</span></td><td><a href='/guix/commit/NEWS?id=55a433ebb0b2deb69141619d0a0b1e298a969c36'>Update NEWS.</a></td><td>Ricardo Wurmus</td></tr>
<tr><td><span title='2018-05-20 21:42:32 +0300'>2018-05-20</span></td><td><a href='/guix/commit/NEWS?id=e9d271ed9a1fba86f372986a137b6110a41a1324'>services: Add Enlightenment desktop service.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/services/desktop.scm (&lt;enlightenment-desktop-configuration&gt;,
enlightenment-desktop-service-type): New variables.
* doc/guix.texi (Desktop Services): Document the service.
* NEWS: Mention it.
</span></span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2018-05-08 21:55:46 -0700'>2018-05-08</span></td><td><a href='/guix/commit/NEWS?id=ede121de426f9c56820852888a0b370f0ccbce49'>guix: Separate the package name and version with "@", not "-".</a><span class='msg-avail'>...<span class='msg-tooltip'>* guix/packages.scm (package-full-name): By default, use "@" to separate
  the package name and package version.  Add an optional delimiter
  argument so that there is still a way to explicitly use a different
  delimiter.
* gnu/packages/commencement.scm (gcc-boot0) &lt;unpack-gmp&amp;co&gt;: Adjust
  accordingly.
* tests/graph.scm: Adjust accordingly.
* tests/profiles.scm: Adjust accordingly.
* NEWS: Mention the change.

Fixes: &lt;https://bugs.gnu.org/31088&gt;.
Reported by Pierre Neidhardt &lt;ambrevar@gmail.com&gt;.
</span></span></td><td>Chris Marusich</td></tr>
<tr><td><span title='2017-12-06 09:14:53 +0100'>2017-12-06</span></td><td><a href='/guix/commit/NEWS?id=40f5c53d89da266055a1dd6571c380f5c57fe5f9'>Update NEWS.</a></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2017-12-06 08:58:26 +0100'>2017-12-06</span></td><td><a href='/guix/commit/NEWS?id=f0eb57b736f6fae67acbaad66a1b5e18fdfc10a0'>Update NEWS.</a></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2017-12-05 15:37:01 +0100'>2017-12-05</span></td><td><a href='/guix/commit/NEWS?id=f3e3f4d934ee0ecd71f5c73a57252ed1d0bad88e'>Update NEWS.</a></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2017-12-04 17:56:11 +0100'>2017-12-04</span></td><td><a href='/guix/commit/NEWS?id=c735e9e6868bb7661f08ffa008f1feaedf2fcb9e'>Update NEWS.</a></td><td>Ludovic Courtès</td></tr>