ajax: script: Threat sameDomain file:// requests as crossDomain

ajax: script: Threat sameDomain file:// requests as crossDomain

Due to file:// XHR security measures in Chromium[1], dynamic loading
of scripts need to use the script tag injection hack.

FYI: Chromium are considering possible ways to loosen these restrictions[2].

Tested in Chromium 6.0.472.63, Firefox 3.6.7 and Konqueror 4.4.5

[1] http://code.google.com/p/chromium/issues/detail?id=4197
[2] http://code.google.com/p/chromium/issues/detail?id=47416

Signed-off-by: Asbjørn Sloth Tønnesen <ast@mugami.com>