Changes

Bug 1189: Fix gcc redefinition error, even thought typedef equals - on
OpenIndiana w/ old'ish gcc

Bug 1249 - NEWT X11: setVisible(false) IconicState not listening to
_NET_WM_STATE_HIDDEN; setVisible(true) not restoring from
_NET_WM_STATE_HIDDEN
Using Gnome Shell 3.14.4-1~deb8u1 disclosed an issue w/ our newly
utilized IconicState/_NET_WM_STATE_HIDDEN, i.e. visibleChanged(false)
was never received.
This is a regression of commit 2d837a7a7130702ad36b694875613fae77c7ef06, 
which utilizes WM_CHANGE_STATE_IDX + IconicState for visibility on
top-level windows.
This bug consist out of _two_ isssue:
1) setVisible(false) IconicState not listening to _NET_WM_STATE_HIDDEN
 Here, we 'listen' to _NET_WM_STATE_HIDDEN when receiving
ConfigureNotify
 if supported _and_ XMapWindow has been issued.
 In such case existence/non-existence of _NET_WM_STATE_HIDDEN determines
visibility.
 Otherwise, we have wait for MapNotify/UnmapNotify.
  The 'XMapWindow has been issued' criteria is tracked by new field
'JavaWindow.isMapped'
 and set/cleared when we actually issue XMapWindow/XUnmapWindow!
2) setVisible(true) not restoring from _NET_WM_STATE_HIDDEN
 It has been observed that restoring IconicState/_NET_WM_STATE_HIDDEN
 via XMapWindow or even NormalState may not work reliably on WMs.
 See
<https://stackoverflow.com/questions/30192347/how-to-restore-a-window-with-xlib>
  Hence we restore from this WM state via NormalState _and_
_NET_ACTIVE_WINDOW.
Both strategies seem to work well on KDE as well as on Gnome.