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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<div class='path'>path: <a href='/guix/log/?id=9eac3150690bfd9389d433f6053fc07d6d57e45b'>root</a>/<a href='/guix/log/tests?id=9eac3150690bfd9389d433f6053fc07d6d57e45b'>tests</a>/<a href='/guix/log/tests/guix-system.sh?id=9eac3150690bfd9389d433f6053fc07d6d57e45b'>guix-system.sh</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/tests/guix-system.sh?id=9eac3150690bfd9389d433f6053fc07d6d57e45b&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2019-04-29 21:57:52 +0200'>2019-04-29</span></td><td><a href='/guix/commit/tests/guix-system.sh?id=09a9f1097458e57d271b05dbf11f1fe0fd98c088'>tests: Adjust wildcard when testing OS examples.</a><span class='msg-avail'>...<span class='msg-tooltip'>* tests/guix-system.sh: Use *.tmpl instead of *, to avoid catching
backup files, etc.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-01-21 23:09:55 +0100'>2019-01-21</span></td><td><a href='/guix/commit/tests/guix-system.sh?id=f61e6e5238ff43b959c258ed92531029a1c82fa7'>tests: Adjust for removal of 'device' field in &lt;bootloader-configuration&gt;.</a><span class='msg-avail'>...<span class='msg-tooltip'>This is a followup to commit 5f7467f046c3c1648cdf6eb81b3ec041bfc1f9bb.

* tests/guix-system.sh: For &lt;bootloader-configuration&gt; records, use
'target' rather than 'device'.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-01-11 12:14:38 +0100'>2019-01-11</span></td><td><a href='/guix/commit/tests/guix-system.sh?id=84a2de36a10dc2ab80f86e16721cbd228c85279e'>services: Deprecate a few more service procedures.</a><span class='msg-avail'>...<span class='msg-tooltip'>These procedures were already either undocumented (and de facto
deprecated) or documented as deprecated or redundant.

* gnu/services/base.scm (guix-service, guix-publish-service): Mark as
deprecated.
* gnu/services/mcron.scm (mcron-service): Likewise.
* gnu/services/networking.scm (tor-service): Likewise.
* doc/guix.texi (Scheduled Job Execution): Remove 'mcron-service' and
adjust example.
(Networking Services): Remove 'tor-service'.
* gnu/tests/base.scm (%mcron-os): Use 'mcron-service-type' instead of
'mcron-service'.
* gnu/tests/networking.scm (%tor-os): Use 'tor-service-type' instead of
'tor-service'.
* tests/guix-system.sh: Likewise.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2018-10-18 01:12:22 +0200'>2018-10-18</span></td><td><a href='/guix/commit/tests/guix-system.sh?id=39d7fdce453b0ca23ecbed72048647debbaa58a6'>services: dhcp-client: Deprecate 'dhcp-client-service' procedure.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/services/networking.scm (dhcp-client-service-type): Add default
value.
* gnu/system/examples/bare-bones.tmpl: Use (service
dhcp-client-service-type) instead of (dhcp-client-service).
* gnu/system/examples/beaglebone-black.tmpl: Likewise.
* gnu/tests/base.scm (%avahi-os): Likewise.
* gnu/tests/databases.scm (%memcached-os): Likewise.
(%mongodb-os): Likewise.
* gnu/tests/dict.scm (%dicod-os): Likewise.
* gnu/tests/mail.scm (%opensmtpd-os): Likewise.
(%exim-os): Likewise.
(%dovecot-os): Likewise.
* gnu/tests/messaging.scm (run-xmpp-test): Likewise.
(run-bitlbee-test): Likewise.
* gnu/tests/monitoring.scm (%prometheus-node-exporter-os): Likewise.
* gnu/tests/networking.scm (%inetd-os): Likewise.
(run-iptables-test): Likewise.
* gnu/tests/nfs.scm (%base-os): Likewise.
* gnu/tests/rsync.scm (%rsync-os): Likewise.
* gnu/tests/ssh.scm (run-ssh-test): Likewise.
* gnu/tests/version-control.scm (%cgit-os): Likewise.
(%git-http-os): Likewise.
(%gitolite-os): Likewise.
* gnu/tests/virtualization.scm (%libvirt-os): Likewise.
* gnu/tests/web.scm (%httpd-os): Likewise.
(%nginx-os): Likewise.
(%varnish-os): Likewise.
(%php-fpm-os): Likewise.
(%hpcguix-web-os): Likewise.
(%tailon-os): Likewise.
* tests/guix-system.sh: Likewise.
* doc/guix.texi (Networking Services): Document
'dhcp-client-service-type' and remove 'dhcp-client-service'.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2018-09-07 11:40:05 +0200'>2018-09-07</span></td><td><a href='/guix/commit/tests/guix-system.sh?id=1540075c790dfaeff52c93392f2fc63b9e23b77e'>vm: Make UUID computation really deterministic.</a><span class='msg-avail'>...<span class='msg-tooltip'>Fixes &lt;https://bugs.gnu.org/32652&gt;.

* gnu/system/vm.scm (operating-system-uuid)[service-name,
file-system-digest]: New procedures.
Map these over services and file systems and hash the result.
* tests/guix-system.sh: Add test.
</span></span></td><td>Ludovic Courtès</td></tr>