add -DPHONON_EXPORT= to compile methodtest under mingw
add -DPHONON_EXPORT= to compile methodtest under mingw

svn path=/trunk/KDE/kdelibs/phonon/; revision=672231

sandsmark/phonon-visualization-gsoc,sandsmark/phonon-visualization-gsoc,sandsmark/phonon-visualization-gsoc,sandsmark/phonon-visualization-gsoc