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 },
ption value='koszko-scripts'>koszko-scripts</option>
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<tr><td><span title='2017-05-01 17:27:54 +0200'>2017-05-01</span></td><td><a href='/guix/commit/tests/guix-build.sh?id=e30c2be10da8929e42aafc7770257e84de49ffbb'>packages: Remove support for PACKAGE-VERSION deprecated syntax.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2017-04-21 17:23:37 +0200'>2017-04-21</span></td><td><a href='/guix/commit/tests/guix-build.sh?id=1397b422e254929de1805aaf1d0759cd5da6a60b'>store: 'GUIX_DAEMON_SOCKET' can now be a URI.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2017-03-19 18:14:22 +0100'>2017-03-19</span></td><td><a href='/guix/commit/tests/guix-build.sh?id=f6396d862f9f8ce0c0e6894ce30599773167af0c'>gnu: Rename "guile-next" to "guile".</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2016-10-03 15:24:21 +0200'>2016-10-03</span></td><td><a href='/guix/commit/tests/guix-build.sh?id=d223ac4acc51602e1be91d611ea2b4266edf6ee3'>tests: Adjust 'guix build -S' test for source-less packages.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2016-09-06 23:22:10 +0200'>2016-09-06</span></td><td><a href='/guix/commit/tests/guix-build.sh?id=01afdab89c6a91f4cd05d3c4f4ff95a0402703eb'>packages: Add 'package-superseded' and associated support.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>