I'm jetlagged, so I fixed the rootx problem on win32gcc. The reason why
this was not implemented properly before: root spawns root.exe - which
doesn't work on win32gcc, as root and root.exe are identical (whenever you
build an executable called root you'll end up with a file called
root.exe).

The attached patch will build a root.exe correspodning to unix's root.
When people type "root" that's what they start. The change in
main/Module.mk builds root_exe.exe on win32gcc, corresponding to unix's
root.exe. Obviously, I also had to patch rootx.cxx now; I added a preproc
define ROOTBINARY "root_exe.exe" for win32gcc and "root.exe" otherwise.
Now root properly shows its popup, checks X11 and what not.


git-svn-id: http://root.cern.ch/svn/root/trunk@7008 27541ba8-7e3a-0410-8455-c3a389f83636