Blindwrite 7's ezplay.sys has sections which are consecutive in memory but not
page aligned.  Thus changing the protection to PROT_READWRITE one section at a
time has the effect that old_prot for all sections but the first is set to
PROT_READWRITE (actually, PROT_WRITECOPY), causing us to restore the wrong
protection and the driver to crash in its entry point.

To fix this, protect and unprotect one page at a time while processing it, i.e.
essentially revert 6c0a8c35.  To avoid reintroducing bug 28254, protect two
pages at a time instead of just one.
Signed-off-by: Zebediah Figura <z.figura12@gmail.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>