Simplify the QLibrary plugin-detection code

The reason why the scanning of files was restricted to Unix is lost in
history. My guess is that it was added *because* on Unix you couldn't
do the LoadLibrary trick to load without dependencies. That is, it
makes no comparison to whether scanning is faster than LoadLibrary.

So assume that scanning is faster, especially now that we have memory
mapping in QFile (it wasn't there in Qt 4.0).

This simplifies greatly the codebase because we no longer need to try
to load and later unload the library to check whether it is a Qt
plugin or not, nor deal with Windows non-C++ exceptions. Just scan on
all platforms.

Change-Id: If269e009bfb9920805ca1aa6c2b66aacdd5b26e9
Reviewed-by: Morten Johan Sørvig <morten.sorvig@digia.com>
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>
Reviewed-by: Lars Knoll <lars.knoll@digia.com>
Reviewed-by: Joerg Bornemann <joerg.bornemann@digia.com>

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