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='2023-07-20 10:11:33 +0200'>2023-07-20</span></td><td><a href='/guix/commit/gnu/packages/adns.scm?id=bfcfe53c72f04e825f33269258c5ebbc33b70131'>gnu: c-ares: Skip failing tests on the Hurd.</a><span class='msg-avail'>...</span></td><td>Janneke Nieuwenhuizen</td></tr>
<tr><td><span title='2022-06-26 12:06:30 +0200'>2022-06-26</span></td><td><a href='/guix/commit/gnu/packages/adns.scm?id=7a0e57a81239b5e71e278c69db04e84185567210'>gnu: c-ares: Update to 1.18.1.</a><span class='msg-avail'>...</span></td><td>Marius Bakke</td></tr>
<tr><td><span title='2021-12-23 15:41:15 +0100'>2021-12-23</span></td><td><a href='/guix/commit/gnu/packages/adns.scm?id=94f8ba37cc3eff71809bd197378d075e33a9945c'>gnu: c-ares: Enable tests.</a><span class='msg-avail'>...</span></td><td>Jelle Licht</td></tr>
<tr><td><span title='2021-12-13 17:48:25 +0100'>2021-12-13</span></td><td><a href='/guix/commit/gnu/packages/adns.scm?id=8394619baceb118df92e355377fd543bb1aa501a'>gnu: Simplify package inputs.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2021-11-17 23:43:14 +0100'>2021-11-17</span></td><td><a href='/guix/commit/gnu/packages/adns.scm?id=3a317f7476f8c6012e166ff9f340f861938721c9'>Merge branch 'master' into core-updates-frozen</a></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2021-11-15 22:43:23 +0100'>2021-11-15</span></td><td><a href='/guix/commit/gnu/packages/adns.scm?id=ecbf59abad4e146a80ea2849d12569886bce732e'>gnu: Add c-ares-for-node.</a><span class='msg-avail'>...</span></td><td>Jelle Licht</td></tr>
<tr><td><span title='2021-10-18 14:37:26 +0000'>2021-10-18</span></td><td><a href='/guix/commit/gnu/packages/adns.scm?id=e486b2b674badc80627b11077b7df2ac1cab92d8'>Merge remote-tracking branch 'signed/master' into core-updates</a></td><td>Mathieu Othacehe</td></tr>