Remove this test to verify that things were modified since a certain time.

That assumption doesn't hold up when your environment doesn't have access to a
real clock and thinks it's living in 1970 :)

--- a/tests/test_fileapp.py    2015-04-23 13:48:37.000000000 -0700
+++ b/tests/test_fileapp.py	2016-02-22 19:20:08.332802417 -0800
@@ -223,8 +223,6 @@
                   status=304)
     res = app.get('/', headers={'If-None-Match': 'asdf'},
                   status=200)
-    res = app.get('/', headers={'If-Modified-Since': 'Sat, 1 Jan 2005 12:00:00 GMT'},
-                  status=200)
     res = app.get('/', headers={'If-Modified-Since': last_mod + '; length=100'},
                   status=304)
     res = app.get('/', headers={'If-Modified-Since': 'invalid date'},
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<tr><td><span title='2023-05-11 13:21:45 +0200'>2023-05-11</span></td><td><a href='/guix/commit/gnu/services/authentication.scm?id=2df5d4fd18a2fbcb8066a50e2da8ec64635f5162'>system: pam: Let PAM extensions add shepherd requirements.</a><span class='msg-avail'>...</span></td><td>Josselin Poiret</td></tr>
<tr><td><span title='2022-06-15 00:25:21 +0200'>2022-06-15</span></td><td><a href='/guix/commit/gnu/services/authentication.scm?id=8cb1a49a3998c39f315a4199b7d4a121a6d66449'>services: configuration: Use *unspecified* instead of 'disabled.</a><span class='msg-avail'>...</span></td><td>Attila Lendvai</td></tr>
<tr><td><span title='2021-11-30 01:08:55 +0100'>2021-11-30</span></td><td><a href='/guix/commit/gnu/services/authentication.scm?id=892f1b7273d57b25940700877a02618fe826cc08'>services: Accept &lt;inferior-package&gt;s in lieu of &lt;package&gt;s.</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2021-03-10 18:01:47 +0100'>2021-03-10</span></td><td><a href='/guix/commit/gnu/services/authentication.scm?id=520bac7ed00a949a0391ad680de65a1498105c2b'>services: Prevent following symlinks during activation.</a><span class='msg-avail'>...</span></td><td>Maxime Devos</td></tr>