As reported by Matthias Vorwerk at
http://svn.haxx.se/users/archive-2014-07/0175.shtml
the svn:global-ignores property is not inherited if the node on which the
property is isn't part of the working copy.
The reason seems to be a disagreement about the property name. When
filter_unwanted_props() is called during 'svn status', the global-ignores
property is inadvertantly filtered out:
10240 if (strcmp(ipropname, propname) != 0)
(gdb) p ipropname
$5 = 0x21281cfda20 "global-ignores"
(gdb) p propname
$6 = 0x211f750bba6 "svn:global-ignores"