[CMake] Suggesting to FindQT4.cmake where to find QT4

[Jed Brown]

Alan W. Irwin wrote:

> My experience is that you can cleanly distinguish between various Qt4
> versions by simply putting qmake for the version you want first on
> your PATH.

Do you seriously consider this a solution, or just a hack that works for
you?  It breaks as soon as you have two packages

/path/a/foo
/path/a/bar
/path/b/foo
/path/b/bar

The user should not need to go to great contortions to use /path/a/foo
with /path/b/bar.

Jed

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