add core patch for APC redeclared class bug #3202

#3202

Contents of patch:

```git
diff --git a/includes/database/database.inc b/includes/database/database.inc
index 339c9b0..c816ecd 100644
--- a/includes/database/database.inc
+++ b/includes/database/database.inc
@@ -1,6 +1,14 @@
 <?php
 
 /**
+ * Sorry to patch core; fixes known APC "cannot redeclare class" bug.
+ *
+ * @see https://drupal.org/node/838744
+ * @see http://goo.gl/JZi05
+ */
+if (!class_exists('insertquery_mysql')) {
+
+/**
  * @file
  * Core systems for the database layer.
  *
@@ -3037,3 +3045,8 @@ function db_ignore_slave() {
     $_SESSION['ignore_slave_server'] = REQUEST_TIME + $duration;
   }
 }
+
+/**
+ * @see top of this file.
+ */
+}
```