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)))))
 
 
ko-scripts</option>
</select> <input type='submit' value='switch'/></form></td></tr>
<tr><td class='sub'>Wojtek's customized Guix</td><td class='sub right'></td></tr></table>
<table class='tabs'><tr><td>
<a href='/guix/about/'>about</a><a href='/guix/'>summary</a><a href='/guix/refs/?id=2710df38b0c317bdc69c61c7775d8141eb214dd1'>refs</a><a class='active' href='/guix/log/etc/gnu-store.mount.in'>log</a><a href='/guix/tree/etc/gnu-store.mount.in?id=2710df38b0c317bdc69c61c7775d8141eb214dd1'>tree</a><a href='/guix/commit/etc/gnu-store.mount.in?id=2710df38b0c317bdc69c61c7775d8141eb214dd1'>commit</a><a href='/guix/diff/etc/gnu-store.mount.in?id=2710df38b0c317bdc69c61c7775d8141eb214dd1'>diff</a></td><td class='form'><form class='right' method='get' action='/guix/log/etc/gnu-store.mount.in'>
<input type='hidden' name='id' value='2710df38b0c317bdc69c61c7775d8141eb214dd1'/><select name='qt'>
<option value='grep'>log msg</option>
<option value='author'>author</option>
<option value='committer'>committer</option>
<option value='range'>range</option>
</select>
<input class='txt' type='search' size='10' name='q' value=''/>
<input type='submit' value='search'/>
</form>
</td></tr></table>
<div class='path'>path: <a href='/guix/log/?id=2710df38b0c317bdc69c61c7775d8141eb214dd1'>root</a>/<a href='/guix/log/etc?id=2710df38b0c317bdc69c61c7775d8141eb214dd1'>etc</a>/<a href='/guix/log/etc/gnu-store.mount.in?id=2710df38b0c317bdc69c61c7775d8141eb214dd1'>gnu-store.mount.in</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/etc/gnu-store.mount.in?id=2710df38b0c317bdc69c61c7775d8141eb214dd1&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2020-05-16 15:37:41 +0200'>2020-05-16</span></td><td><a href='/guix/commit/etc/gnu-store.mount.in?id=1a1faa78b0498fbb71f1533beb4b65817c1d3f2a'>etc: Add a systemd unit to bind-mount @storedir@ read-only.</a><span class='msg-avail'>...<span class='msg-tooltip'>* etc/gnu-store.mount.in: New file.
* nix/local.mk (nodist_systemdservice_DATA): Add it.
(etc/%.mount): New rule for it.
* etc/guix-install.sh (sys_enable_guix_daemon): Install it.
* doc/guix.texi (Binary Installation): Document it.
* .gitignore: Ignore changes to it.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>