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='2021-12-13 17:48:25 +0100'>2021-12-13</span></td><td><a href='/guix/commit/gnu/packages/popt.scm?id=8394619baceb118df92e355377fd543bb1aa501a'>gnu: Simplify package inputs.</a></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2021-04-10 14:11:27 +0200'>2021-04-10</span></td><td><a href='/guix/commit/gnu/packages/popt.scm?id=80a63aefc2f39fd63b9624c0d1cb579c99cdf518'>gnu: popt: Fix typo in description.</a></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2020-07-25 16:16:11 +0200'>2020-07-25</span></td><td><a href='/guix/commit/gnu/packages/popt.scm?id=e605d3bd54118605281a472c97db3d74e7b97b63'>gnu: popt: Update to 1.18.</a></td><td>Marius Bakke</td></tr>
<tr><td><span title='2020-07-12 23:08:15 +0200'>2020-07-12</span></td><td><a href='/guix/commit/gnu/packages/popt.scm?id=b0e7b6992f3f845e83cfbca4d700b51dba50b4d5'>gnu: Remove ".git" from "https://github/…/….git".</a></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2020-05-29 23:11:37 +0200'>2020-05-29</span></td><td><a href='/guix/commit/gnu/packages/popt.scm?id=91c8b23e571b90e2d263194c9fbb2b05c0475dc1'>gnu: popt: Remove defunct mirror.</a></td><td>Marius Bakke</td></tr>