lib: Add Platform::hasMssqlSupport()

refs #9683

library/Icinga/Application/Platform.php

@@ -318,6 +318,18 @@ class Platform
         return false;
     }
 
+    /**
+     * Return whether it's possible to connect to a MSSQL database
+     *
+     * Checks whether the Zend framework adapter for MSSQL is available
+     *
+     * @return  bool
+     */
+    public static function hasMssqlSupport()
+    {
+        return static::classExists('Zend_Db_Adapter_Pdo_Mssql');
+    }
+
     /**
      * Return whether it's possible to connect to a MySQL database
      *