rootlibs.pri, rootcintrule.pri
  -  Replace the "gmake" variable $(QMAKE_TARGET) with the "qmake"
variable $$TARGET to compile on Windows. (Workaround of Qt qmake Bug in
Windows)
  -  Restore the "LIBS"  qmake variable to compile on Windows

TQtClientGuard.cxx:
  - Remove the redundant operation

TQtClientFilter.cxx:
   Set the "closing" flag to generate the artificial "close" event

GQtGUI.cxx:
  - Generate the artificial kDestroyNotify ROOT event

TQtClientWidget.cxx:
   - Send the artificial ROOT kDestroyEvent

----------------------

These allow to resolve or improve:

- File Dialogs (Open and Save As) [4]

[17-Oct-05] Causes SegV if invoking several times via canvas File menu /
Open or File menu / SaveAs...

- Menu Widgets [5] [3-Oct-05]

Opening the "Save As" dialog, closing it, closing the canvas window on
the right upper cross and opening the same window canvas again causes a
SegV (not every time).

- Combo Box [6]

[17-Oct-05] Closing the window with a combo box by selecting "Close" on
the menu opened by clicking on the left upper corner of the window
displays the message:
QEvent::Close spontaneous 0:

[17-Oct-05] After opening the combo box list entries, closing the canvas
on the right upper corner cross leaves the popped up list entries open.
Selecting on entry after causes SegV


- List Box [9]

[17-Oct-05] Closing the window with a list box by selecting "Close" on
the menu    opened by clicking on the left upper corner of the window
displays the message:
QEvent::Close spontaneous 0:


git-svn-id: http://root.cern.ch/svn/root/trunk@13022 27541ba8-7e3a-0410-8455-c3a389f83636