fix qt4 build

due to the removal of explicit moc includes the qt4 build broke as the
plugin helpers were multi-defined (not that I knew why). easy way out is
moving Q_EXPORT_PLUGIN2 from the .h to the .cpp as recommended by the qt
docs anyway.

> There should be exactly one occurrence of this macro in the source code
> for a Qt plugin, and it should be used where the implementation is
> written rather than in a header file.

http://build.kde.org/job/breeze_master/82/console

CCMAIL: kfunk@kde.org

kstyle/breezestyleplugin.cpp

@@ -23,6 +23,10 @@
 
 #include <QApplication>
 
+#if QT_VERSION < 0x050000
+Q_EXPORT_PLUGIN2( breeze-qt, Breeze::StylePlugin )
+#endif
+
 namespace Breeze
 {
 

kstyle/breezestyleplugin.h

@@ -54,8 +54,4 @@ namespace Breeze
 
 }
 
-#if QT_VERSION < 0x050000
-Q_EXPORT_PLUGIN2( breeze-qt, Breeze::StylePlugin )
-#endif
-
 #endif