tests: Mark several additional tests as can_fail on GNU Hurd

These consistently fail on scheduled CI runs, which is not helping our
ability to catch Hurd regressions.

For example, https://gitlab.gnome.org/GNOME/glib/-/jobs/3709402

Signed-off-by: Philip Withnall <pwithnall@gnome.org>

See: #3148

gio/tests/meson.build

@@ -457,6 +457,8 @@ if host_machine.system() != 'windows'
       'gdbus-connection-slow' : {
         'extra_sources' : extra_sources,
         'extra_programs': extra_programs + ['gdbus-connection-flush-helper'],
+        # FIXME: https://gitlab.gnome.org/GNOME/glib/-/issues/3148
+        'can_fail' : host_system == 'gnu',
       },
       'gdbus-error' : {'extra_sources' : extra_sources},
       'gdbus-exit-on-close' : {'extra_sources' : extra_sources},

glib/tests/meson.build

@@ -141,9 +141,13 @@ glib_tests = {
   'spawn-singlethread' : {
     'dependencies' : [winsock2],
     'extra_programs' : ['test-spawn-echo'],
+    # FIXME: https://gitlab.gnome.org/GNOME/glib/-/issues/3148
+    'can_fail' : host_system == 'gnu',
   },
   'spawn-test' : {
     'extra_programs' : host_machine.system() == 'windows' ? ['spawn-test-win32-gui'] : [],
+    # FIXME: https://gitlab.gnome.org/GNOME/glib/-/issues/3148
+    'can_fail' : host_system == 'gnu',
   },
   'strfuncs' : {},
   'string' : {

gobject/tests/meson.build

@@ -84,7 +84,10 @@ gobject_tests = {
   'bindinggroup' : {},
   'properties' : {},
   'properties-introspection' : {},
-  'reference' : {},
+  'reference' : {
+    # FIXME: https://gitlab.gnome.org/GNOME/glib/-/issues/3148
+    'can_fail' : host_system == 'gnu',
+  },
   'flags' : {},
   'value' : {},
   'type' : {},