Fix over a hundred thousand warnings by:

Fix over a hundred thousand warnings by:
- Disabling C4214 (nonstandard extension used : bit field types other than int), a somewhat overzealous warning for a "nonstandard" extension we rely on all over.
- Defining inactive DPRINT and friends for MSVC using __noop (no not __nop, __noop. See  https://msdn.microsoft.com/en-us/library/s6btaxcs.aspx) to get at a whole bunch of C4127 (conditional expression is constant).
- Remove the last of the exported DriverEntry from dxg and dxgthk. There is no need in anyw way to export them -- dxg exports DxDdStartupDxGraphics to Win32k for initialization purposes and dxgthk is just a forwarder. Linking to a DriverEntry is to begin with is a pretty bad idea. Say goodbye to the last of LNK4216.

svn path=/trunk/; revision=69187