We can't split during salvage: first, turn off raw compression (because
we can't control when/where raw compression chooses to split), and then
choose a page size which guarantees we won't need to split.  Ref #1190.
Unused variable.
One more time, this function doesn't return an error (and I don't see any
particular value in making it return an error), I'm only calling it from
the leaf-page functions.