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='2024-02-10 22:59:43 +0100'>2024-02-10</span></td><td><a href='/guix/commit/gnu/build/secret-service.scm?id=f331a667d3827c5c7603c87956c601d5e42ef82b'>services: secret-service: Make the endpoint configurable.</a><span class='msg-avail'>...<span class='msg-tooltip'>Until now, the secret service had a hard-coded TCP endpoint on port
1004.  This change lets users specify arbitrary socket addresses.

* gnu/build/secret-service.scm (socket-address-&gt;string): New procedure,
taken from Shepherd.
(secret-service-send-secrets): Replace ‘port’ by ‘address’ and adjust
accordingly.
(secret-service-receive-secrets): Likewise.
* gnu/services/virtualization.scm (secret-service-shepherd-services):
Likewise.
(secret-service-operating-system): Add optional ‘address’ parameter and
honor it.  Adjust ‘start’ method accordingly.

Change-Id: I87a9514f1c170dca756ce76083d7182c6ebf6578
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2023-10-01 22:58:19 +0200'>2023-10-01</span></td><td><a href='/guix/commit/gnu/build/secret-service.scm?id=e90a972ce232a6a57995df1ed90c9ddbaf5dbcae'>secret-service: Increase default handshake timeout.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/build/secret-service.scm (secret-service-send-secrets):
Increase #:handshake-timeout.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2023-05-06 17:12:45 +0200'>2023-05-06</span></td><td><a href='/guix/commit/gnu/build/secret-service.scm?id=e88bf64e6fa61265dca81a799ce824f639a2875a'>services: dbus-service, secret-service: Do not cause (fibers) to be loaded.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/build/dbus-service.scm (sleep*): Pass #:ensure #f to 'resolve-module'.
* gnu/build/secret-service.scm (wait-for-readable-fd): Likewise.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2022-09-13 00:31:04 +0200'>2022-09-13</span></td><td><a href='/guix/commit/gnu/build/secret-service.scm?id=491dd62b38e1772f3e50de58118d9b9ac97272ff'>secret-service: Mark sockets as SOCK_CLOEXEC.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/build/secret-service.scm (secret-service-send-secrets)
(secret-service-receive-secrets): Pass SOCK_CLOEXEC to 'socket'.
</span></span></td><td>Ludovic Courtès</td></tr>