Remove repeated find_package() from CMakeLists.txt
Remove repeated find_package() from CMakeLists.txt

Fixes lxde/lxqt-panel#63

Ilya87/lxqt-panel,jubalh/lxqt-panel,zvacet/lxqt-panel,zjes/lxqt-panel,stefonarch/lxqt-panel,stefonarch/lxqt-panel,jubalh/lxqt-panel,cferr/lxqt-panel,zvacet/lxqt-panel,jeremywh7/lxqt-panel,ThomasVie/lxqt-panel-de,zjes/lxqt-panel,ThomasVie/lxqt-panel-de,rbazaud/lxqt-panel,DrTobe/lxqt-panel,pmattern/lxqt-panel,musarder/lxqt-panel,rysiowski/lxqt-panel,musarder/lxqt-panel,Ilya87/lxqt-panel,cferr/lxqt-panel,npmiller/lxqt-panel,stefonarch/lxqt-panel,hagabaka/lxqt-panel,lxde/lxqt-panel,jeremywh7/lxqt-panel,rysiowski/lxqt-panel,pmattern/lxqt-panel,hagabaka/lxqt-panel,lxde/lxqt-panel,rbazaud/lxqt-panel,npmiller/lxqt-panel,DrTobe/lxqt-panel