This also fixes the test that an earlier patch broke, so the todo_wine can be
removed again.

Also fix a crash in running the tests on Win95.

These platforms only write 8 bytes into the stream so cope appropriately.

wininet: Make sure that we have some data buffered before sending INTERNET_STATUS_REQUEST_COMPLETE notification.

This prevents some needless searching for the start of the paragraph
from a run stored in a cursor.  Usually a pointer to the paragraph is
already available when the cursor is set anyway.

sane.ds: Revise the logic around processing events to reflect the need for us to generate and post a message to drive Sane events.

sane.ds: Add partial stub support for ICAP_PIXELTYPE, with tests. Fixes a first crash in Adobe Acrobat scanning support.