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='2024-09-14 10:36:59 +0200'>2024-09-14</span></td><td><a href='/guix/commit/gnu/packages/smalltalk.scm?id=607280fa8fe26b500ad76a3769da8e4f917cae16'>gnu: smalltalk: Disable tests on x86-64.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/smalltalk.scm (smalltalk)[arguments]: Disable tests on x86-64.

Change-Id: I6838e94545df4c11f048b06dfbfd99358bf240a3
</span></span></td><td>Guillaume Le Vaillant</td></tr>
<tr><td><span title='2024-09-13 15:00:06 +0200'>2024-09-13</span></td><td><a href='/guix/commit/gnu/packages/smalltalk.scm?id=22a34ea792ef0df15fd30d46f557b572c61d5404'>gnu: smalltalk: Fix tests.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/smalltalk.scm (smalltalk)[native-inputs]: Add
'(libc-utf8-locales-for-target)'.

Change-Id: Idf49394e5c4dbd3398a6774319184339ed18585c
Signed-off-by: Guillaume Le Vaillant &lt;glv@posteo.net&gt;
</span></span></td><td>Greg Hogan</td></tr>