Drop use of the deprecated time.clock which was removed in Python 3.8.

Adapted from upstream pull request:

https://github.com/dlitz/pycrypto/pull/296

diff --git a/lib/Crypto/Random/_UserFriendlyRNG.py b/lib/Crypto/Random/_UserFriendlyRNG.py
--- a/lib/Crypto/Random/_UserFriendlyRNG.py
+++ b/lib/Crypto/Random/_UserFriendlyRNG.py
@@ -73,8 +73,11 @@ class _EntropyCollector(object):
         t = time.time()
         self._time_es.feed(struct.pack("@I", int(2**30 * (t - floor(t)))))
 
-        # Add the fractional part of time.clock()
-        t = time.clock()
+        # Add the fractional part of time.process_time()
+        try:
+           t = time.process_time()
+        except AttributeError:
+           t = time.clock()
         self._clock_es.feed(struct.pack("@I", int(2**30 * (t - floor(t)))))
 
 
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<tr><td><span title='2024-08-31 10:42:14 +0200'>2024-08-31</span></td><td><a href='/guix/commit/gnu/packages/polkit.scm?id=a68d52a000c0a0f5b103672aec1c00b626e41518'>gnu: Remove unneeded libxml2 from native-inputs. (libxslt)</a><span class='msg-avail'>...<span class='msg-tooltip'>XML_CATALOG_FILES is already set within libxslt so it's unnecessary to include
libxml2 for the same effect.

* gnu/packages/freedesktop.scm (wayland): Remove obsolete comment.
(farstream, elogind, packagekit, accountsservice, plymouth)[native-inputs]:
Remove libxml2.
* gnu/packages/benchmark.scm (sysbench)[native-inputs]: Ditto.
* gnu/packages/cluster.scm (drbd-utils)[native-inputs]: Ditto.
* gnu/packages/glib.scm (dbus)[native-inputs]: Ditto.
* gnu/packages/gnome.scm (gnome-keyring, glade3, dconf, libsecret, colord)
(upower, gnome-settings-daemon)[native-inputs]: Ditto.
* gnu/packages/linux.scm (eudev)[native-inputs]: Ditto.
* gnu/packages/networking.scm (iputils)[native-inputs]: Ditto.
* gnu/packages/ocr.scm (tesseract-ocr)[native-inputs]: Ditto.
* gnu/packages/polkit.scm (polkit)[native-inputs]: Ditto.
* gnu/packages/samba.scm (samba/pinned)[native-inputs]: Ditto.
* gnu/packages/sssd.scm (adcli)[native-inputs]: Ditto.
* gnu/packages/terminals.scm (kmscon)[native-inputs]: Ditto.

Signed-off-by: Maxim Cournoyer &lt;maxim.cournoyer@gmail.com&gt;
Change-Id: Ica3fb5a8e23ad928c53ae508c02777d78c635af0
</span></span></td><td>Bruno Victal</td></tr>
<tr><td><span title='2024-07-18 10:44:58 +0800'>2024-07-18</span></td><td><a href='/guix/commit/gnu/packages/polkit.scm?id=ea812cf80c7d7a16a861806f95fba0ebe690550c'>gnu: Add polkit-qt6.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/polkit.scm (polkit-qt6): New variable.

Change-Id: Ifc78e3c94ecb38c6edc9b3e1a6dde90729ce8128
</span></span></td><td>Zheng Junjie</td></tr>
<tr><td><span title='2024-07-18 10:44:58 +0800'>2024-07-18</span></td><td><a href='/guix/commit/gnu/packages/polkit.scm?id=cc753336251ac46db2f6c89ec6c840e3267800d4'>gnu: polkit-qt: Update to 0.200.0.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/polkit.scm (polkit-qt): Update to 0.200.0.
[propagated-inputs]: Remove it.
[inputs]: Add qtbase-5.
[arguments]&lt;#:configure-flags&gt;: Update.
[properties]: Set upstream-name.

Change-Id: Ibb33a7b0ea627b15062c013c233778154cdbf357
</span></span></td><td>Zheng Junjie</td></tr>