Fixed regression introduced by inlining CRC + copy

Fixed regression introduced by inlining CRC + copy

Pretty much every time updatewindow has been called, implicitly a
checksum was performed unless on s/390 or state->wrap & 4 == 0. The
inflateSetDictionary function instead separately calls this checksum
before invoking update window and checks the checksum to see if it
matches the initial checksum (a property that happens from parsing the
DICTID section of the headers).

Instead, we can make updatewindow have a "copy" parameter, which is the
state->wrap value that is being checked anyway.  We instead move the 3rd
bit check to be checked by the caller rather than the callee.