Disable tests that rely on usable DNS lookups, which aren't available
in build chroots.

--- libevent-2.0.21-stable/test/regress_dns.c	2013-01-20 22:32:09.000000000 +0100
+++ libevent-2.0.21-stable/test/regress_dns.c	2013-01-20 22:32:30.000000000 +0100
@@ -1827,10 +1827,6 @@ end:
 
 struct testcase_t dns_testcases[] = {
 	DNS_LEGACY(server, TT_FORK|TT_NEED_BASE),
-	DNS_LEGACY(gethostbyname, TT_FORK|TT_NEED_BASE|TT_NEED_DNS),
-	DNS_LEGACY(gethostbyname6, TT_FORK|TT_NEED_BASE|TT_NEED_DNS),
-	DNS_LEGACY(gethostbyaddr, TT_FORK|TT_NEED_BASE|TT_NEED_DNS),
-	{ "resolve_reverse", dns_resolve_reverse, TT_FORK, NULL, NULL },
 	{ "search", dns_search_test, TT_FORK|TT_NEED_BASE, &basic_setup, NULL },
 	{ "search_cancel", dns_search_cancel_test,
 	  TT_FORK|TT_NEED_BASE, &basic_setup, NULL },
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<tr><td><span title='2020-02-05 16:18:58 +0100'>2020-02-05</span></td><td><a href='/guix/commit/tests/graph.scm?id=312df1d40cf2d61fc96b32efedc16d958718fc48'>tests: Adjust reverse-bag graph test to recent OCaml changes.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-03-23 23:16:55 +0100'>2019-03-23</span></td><td><a href='/guix/commit/tests/graph.scm?id=8c14f7f8a7ab0722bf4c9f92fd28ae85514d564f'>Merge branch 'staging' into core-updates</a></td><td>Marius Bakke</td></tr>
<tr><td><span title='2019-03-23 18:15:36 +0100'>2019-03-23</span></td><td><a href='/guix/commit/tests/graph.scm?id=2b81eac01e5828c6fce61b3cafc0f78e7a0ab891'>graph: Add the 'reverse-bag' graph.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2018-09-22 22:40:12 +0200'>2018-09-22</span></td><td><a href='/guix/commit/tests/graph.scm?id=a2b2070b679ff7e92d856c7d6775f5f67ce4792d'>bootstrap: %bootstrap-inputs: Wrap input lists into thunks.</a><span class='msg-avail'>...</span></td><td>Jan Nieuwenhuizen</td></tr>
<tr><td><span title='2018-06-06 14:37:35 +0200'>2018-06-06</span></td><td><a href='/guix/commit/tests/graph.scm?id=a99b0ad785d5b31e9d9efd2d186ab5d53544b631'>tests: Adjust graph test.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2018-05-08 21:55:46 -0700'>2018-05-08</span></td><td><a href='/guix/commit/tests/graph.scm?id=ede121de426f9c56820852888a0b370f0ccbce49'>guix: Separate the package name and version with "@", not "-".</a><span class='msg-avail'>...</span></td><td>Chris Marusich</td></tr>
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<tr><td><span title='2017-12-17 22:27:21 +0100'>2017-12-17</span></td><td><a href='/guix/commit/tests/graph.scm?id=cafc97e2f37f18e106c9a9cb9110a1862e9d0526'>graph: Adjust test for glibc:static among the implicit inputs.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2017-01-04 16:18:53 +0100'>2017-01-04</span></td><td><a href='/guix/commit/tests/graph.scm?id=b96a0640a3ca128c0b9bf9acaef7b3b7a8bb1455'>graph: Add '%reverse-package-node-type'.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>