lib: Add Platform::hasOracleSupport()

refs #9683

library/Icinga/Application/Platform.php

@@ -342,6 +342,18 @@ class Platform
         return static::extensionLoaded('mysql') && static::classExists('Zend_Db_Adapter_Pdo_Mysql');
     }
 
+    /**
+     * Return whether it's possible to connect to a Oracle database using PDO_OCI
+     *
+     * Checks whether the OCI PDO extension has been loaded and the Zend framework adapter for Oci is available
+     *
+     * @return  bool
+     */
+    public static function hasOracleSupport()
+    {
+        return static::extensionLoaded('pdo_oci') && static::classExists('Zend_Db_Adapter_Pdo_Mysql');
+    }
+
     /**
      * Return whether it's possible to connect to a PostgreSQL database
      *