[NTOS]: Disable support for global pages since it does not seem to work right on...

[NTOS]: Disable support for global pages since it does not seem to work right on real hardware. Additionally, the code had been previously enabling global pages before the variable determining the support for such pages was even enabled, causing non-global pages to be used initially, followed later by global pages once the variable had been setup. To fix this mess, remove all global page support for now. Fixes booting on certain real hardware (or fixes other random memory corruptions).
Thanks to Caemyr.

svn path=/trunk/; revision=45627