Since guix-daemon runs in a separate networking name space, the only
interface available is "lo".  However its index is incremented by one
at each build, so it can end up being greater than 255, leading to an
assertion failure in 'find_ifname_and_index'.

Work around that by directly querying the index of "lo".

--- glib-2.38.0/gio/tests/network-address.c	2013-09-17 20:47:14.000000000 +0200
+++ glib-2.38.0/gio/tests/network-address.c	2013-10-16 21:52:42.000000000 +0200
@@ -117,7 +117,7 @@ test_parse_host (gconstpointer d)
 #define SCOPE_ID_TEST_PORT 99
 
 #ifdef HAVE_IF_INDEXTONAME
-static char SCOPE_ID_TEST_IFNAME[IF_NAMESIZE];
+static char SCOPE_ID_TEST_IFNAME[] = "lo";
 static int SCOPE_ID_TEST_INDEX;
 #else
 #define SCOPE_ID_TEST_IFNAME "1"
@@ -131,11 +131,7 @@ find_ifname_and_index (void)
     return;
 
 #ifdef HAVE_IF_INDEXTONAME
-  for (SCOPE_ID_TEST_INDEX = 1; SCOPE_ID_TEST_INDEX < 255; SCOPE_ID_TEST_INDEX++) {
-    if (if_indextoname (SCOPE_ID_TEST_INDEX, SCOPE_ID_TEST_IFNAME))
-      break;
-  }
-  g_assert_cmpstr (SCOPE_ID_TEST_IFNAME, !=, "");
+  SCOPE_ID_TEST_INDEX = if_nametoindex (SCOPE_ID_TEST_IFNAME);
 #endif
 }
6f0ff71d2a303b86473f'>refs</a><a class='active' href='/guix/log/gnu/packages/smalltalk.scm'>log</a><a href='/guix/tree/gnu/packages/smalltalk.scm?id=5ed3a285077d6ca08cd86f0ff71d2a303b86473f'>tree</a><a href='/guix/commit/gnu/packages/smalltalk.scm?id=5ed3a285077d6ca08cd86f0ff71d2a303b86473f'>commit</a><a href='/guix/diff/gnu/packages/smalltalk.scm?id=5ed3a285077d6ca08cd86f0ff71d2a303b86473f'>diff</a></td><td class='form'><form class='right' method='get' action='/guix/log/gnu/packages/smalltalk.scm'>
<input type='hidden' name='id' value='5ed3a285077d6ca08cd86f0ff71d2a303b86473f'/><select name='qt'>
<option value='grep'>log msg</option>
<option value='author'>author</option>
<option value='committer'>committer</option>
<option value='range'>range</option>
</select>
<input class='txt' type='search' size='10' name='q' value=''/>
<input type='submit' value='search'/>
</form>
</td></tr></table>
<div class='path'>path: <a href='/guix/log/?id=5ed3a285077d6ca08cd86f0ff71d2a303b86473f'>root</a>/<a href='/guix/log/gnu?id=5ed3a285077d6ca08cd86f0ff71d2a303b86473f'>gnu</a>/<a href='/guix/log/gnu/packages?id=5ed3a285077d6ca08cd86f0ff71d2a303b86473f'>packages</a>/<a href='/guix/log/gnu/packages/smalltalk.scm?id=5ed3a285077d6ca08cd86f0ff71d2a303b86473f'>smalltalk.scm</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/gnu/packages/smalltalk.scm?id=5ed3a285077d6ca08cd86f0ff71d2a303b86473f&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2021-12-13 17:48:25 +0100'>2021-12-13</span></td><td><a href='/guix/commit/gnu/packages/smalltalk.scm?id=8394619baceb118df92e355377fd543bb1aa501a'>gnu: Simplify package inputs.</a></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2021-06-04 13:40:02 +0200'>2021-06-04</span></td><td><a href='/guix/commit/gnu/packages/smalltalk.scm?id=f50a88c1fa2e07a668ee87402a5462267d1baf12'>gnu: smalltalk: Find glibc even when cross-compiling.</a></td><td>Maxime Devos</td></tr>
<tr><td><span title='2021-06-04 13:34:58 +0200'>2021-06-04</span></td><td><a href='/guix/commit/gnu/packages/smalltalk.scm?id=961a8f130275dc18cc8e602e0b2ab08b780eb46f'>gnu: smalltalk: Move 'zip' from 'inputs' to 'native-inputs'.</a></td><td>Maxime Devos</td></tr>
<tr><td><span title='2021-06-04 13:34:42 +0200'>2021-06-04</span></td><td><a href='/guix/commit/gnu/packages/smalltalk.scm?id=f5f78d0d0227e80d00cafa1861a8a72a180de074'>gnu: smalltalk: Use 'inputs' in phases instead of '%build-inputs'.</a></td><td>Maxime Devos</td></tr>
<tr><td><span title='2021-01-05 12:51:12 +0100'>2021-01-05</span></td><td><a href='/guix/commit/gnu/packages/smalltalk.scm?id=df965a54e1f18dfd62ec8479623f61f4bddb9760'>gnu: smalltalk: Update to version 3.2.91.</a></td><td>Miguel Ángel Arruga Vivas</td></tr>
<tr><td><span title='2021-01-05 12:51:12 +0100'>2021-01-05</span></td><td><a href='/guix/commit/gnu/packages/smalltalk.scm?id=e3281657c8a97e32169fcc7e178f3fbbab7c88b7'>gnu: smalltalk: Fix integer multiplication overflow.</a></td><td>Miguel Ángel Arruga Vivas</td></tr>