misc: don't use skip_locked if not supported by database (#31264)

passerelle/base/models.py

@@ -14,7 +14,7 @@ from django.apps import apps
 from django.conf import settings
 from django.core.exceptions import ValidationError, ObjectDoesNotExist, PermissionDenied
 from django.core.urlresolvers import reverse
-from django.db import models, transaction
+from django.db import connection, models, transaction
 from django.db.models import Q
 from django.test import override_settings
 from django.utils.text import slugify
@@ -454,7 +454,7 @@ class BaseResource(models.Model):
         # "jobs" cron job to run asynchronous tasks
         resource_type = ContentType.objects.get_for_model(self)
         skip_locked = {'skip_locked': True}
-        if django.VERSION < (1, 11, 0):
+        if django.VERSION < (1, 11, 0) or not connection.features.has_select_for_update_skip_locked:
             skip_locked = {}
         skipped_jobs = []
         while True: