Make ObjectOutputStream's constants available to java.io
Make ObjectOutputStream's constants available to java.io

We will reuse the constants in the upcoming deserialization counterpart.

Signed-off-by: Johannes Schindelin <53fb8db7833fca1e1746dd8592f61048d350f64c@gmx.de>

lostdj/avian,MaartenR/avian,marcinolawski/avian,minor-jason/avian,lwahlmeier/avian,lostdj/avian,joshuawarner32/avian,dicej/avian,ucdseniordesign/avian,joshuawarner32/avian,MaartenR/avian,ucdseniordesign/avian,bigfatbrowncat/avian-pack.avian,joshuawarner32/avian,lostdj/avian,minor-jason/avian,MaartenR/avian,bigfatbrowncat/avian-pack.avian,getlantern/avian,dicej/avian,MaartenR/avian,bgould/avian,getlantern/avian,ucdseniordesign/avian,lwahlmeier/avian,minor-jason/avian,lostdj/avian,bigfatbrowncat/avian-pack.avian,lwahlmeier/avian,dicej/avian,marcinolawski/avian,marcinolawski/avian,lwahlmeier/avian,getlantern/avian,getlantern/avian,bigfatbrowncat/avian-pack.avian,joshuawarner32/avian,ucdseniordesign/avian,bgould/avian,minor-jason/avian,bgould/avian,dicej/avian,marcinolawski/avian,bgould/avian