[CMake] [PATCH] improvement for FindQt4.cmake

[Moreland, Kenneth]

> Hmm, actually I would have expected that if I have a tool 
> which searches 
> for Qt stuff that it would at first look at QTDIR, and then at other 
> options, since QTDIR is there for exactly this purpose, 
> specifying where 
> Qt is installed. 

That may be true for Qt 3, but Qt 4 relies on qmake to find the Qt
directory and PATH to find qmake (a does FindQt4.cmake).  Qt 4 did not
even set QTDIR on my windows install, and I can find no mention of it on
my distribution for Mac.

-Ken

   ****      Kenneth Moreland
    ***      Sandia National Laboratories
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