Hard path building in admin causes admin page error in custom module directories

Hi,

you've hard coded the require_once - path in "socialshareprivacy.admin.inc", Line 7.
If you use custom module folders (i.e. "sites/all/modules/contrib/..." in my case), which is quite common, it causes the administration page to break!

I think you should solve this more flexible by replacing:

require_once(DRUPAL_ROOT . '/sites/all/modules/socialshareprivacy/socialshareprivacy.install');

//with:
require_once(drupal_get_path('module', 'socialshareprivacy') . '/socialshareprivacy.install');

I've hotfixed it this way to use the module and tested it though. Would be great to have this fixed in the next version.

Great module anyway, thanks a lot!!