xfce-panel-plugin.bbclass: pack modules also from ${libdir}/xfce4/panel-plugins
xfce-panel-plugin.bbclass: pack modules also from ${libdir}/xfce4/panel-plugins

* some panel-plugins (e.g xfce4-datetime-plugin) install their modules to
  ${libdir}/xfce4/panel-plugins
* build tested with fresh build dir
* run tested on overo: applications / all available plugins

Signed-off-by: Andreas Müller <d72a15aaaca3a7afa855175c72dc8d2e05931e32@gmx.de>
Signed-off-by: Koen Kooi <42e3d96910f922bdd7dd1805fe3f8aff634f391d@dominion.thruhere.net>

fredcadete/meta-openembedded,sesamstrasse/meta-openembedded,trikset/meta-openembedded,joelagnel/meta-openembedded,lixinfnst/meta-openembedded,rofehr/meta-openembedded,schnitzeltony/meta-openembedded,rofehr/meta-openembedded,rehsack/meta-openembedded,shr-distribution/meta-oe,rehsack/meta-openembedded,sgh/meta-openembedded,rdm-dev/meta-openembedded,dm8tbr/kodi-wip,moto-timo/meta-openembedded,sesamstrasse/meta-openembedded,lgirdk/meta-openembedded,MCherifiOSS/meta-openembedded,victronenergy/meta-openembedded,trikset/meta-openembedded,epylar/meta-openembedded,lgirdk/meta-openembedded,sesamstrasse/meta-openembedded,mrchapp/meta-openembedded,lixinfnst/meta-openembedded,lixinfnst/meta-openembedded,victronenergy/meta-openembedded,dongkc/meta-openembedded,VCTLabs/meta-openembedded,schnitzeltony/meta-openembedded,OSSystems/meta-oe,lixinfnst/meta-openembedded,rdm-dev/meta-openembedded,sigma-embedded/elito-org.openembedded.meta,epylar/meta-openembedded,moto-timo/meta-openembedded,rehsack/meta-openembedded,trikset/meta-openembedded,VCTLabs/meta-openembedded,sgh/meta-openembedded,RedFIR/meta-openembedded,moto-timo/meta-openembedded,openembedded/meta-openembedded,dm8tbr/kodi-wip,fredcadete/meta-openembedded,RedFIR/meta-openembedded,sigma-embedded/elito-org.openembedded.meta,fredcadete/meta-openembedded,shr-distribution/meta-oe,cpdesign/meta-openembedded,n5ac/meta-openembedded,shr-distribution/meta-oe,VCTLabs/meta-openembedded,trikset/meta-openembedded,kraj/meta-openembedded,joelagnel/meta-openembedded,MCherifiOSS/meta-openembedded,n5ac/meta-openembedded,RedFIR/meta-openembedded,n5ac/meta-openembedded,victronenergy/meta-openembedded,victronenergy/meta-openembedded,epylar/meta-openembedded,dongkc/meta-openembedded,fredcadete/meta-openembedded,MCherifiOSS/meta-openembedded,amery/meta-openembedded,VCTLabs/meta-openembedded,dm8tbr/kodi-wip,martiert/meta-openembedded,joelagnel/meta-openembedded,trikset/meta-openembedded,joelagnel/meta-openembedded,rofehr/meta-openembedded,dm8tbr/kodi-wip,moto-timo/meta-openembedded,lixinfnst/meta-openembedded,amery/meta-openembedded,trikset/meta-openembedded,sigma-embedded/elito-org.openembedded.meta,kraj/meta-openembedded,rofehr/meta-openembedded,openembedded/meta-openembedded,amery/meta-openembedded,shr-distribution/meta-oe,sigma-embedded/elito-org.openembedded.meta,n5ac/meta-openembedded,MCherifiOSS/meta-openembedded,rehsack/meta-openembedded,MCherifiOSS/meta-openembedded,RealDigitalMedia/meta-openembedded,RedFIR/meta-openembedded,openembedded/meta-openembedded,epylar/meta-openembedded,epylar/meta-openembedded,rdm-dev/meta-openembedded,joelagnel/meta-openembedded,fredcadete/meta-openembedded,mrchapp/meta-openembedded,amery/meta-openembedded,lgirdk/meta-openembedded,mrchapp/meta-openembedded,RealVNC/yocto_imx6sabreauto_meta-openembedded,RealVNC/yocto_imx6sabreauto_meta-openembedded,epylar/meta-openembedded,shr-distribution/meta-oe,trikset/meta-openembedded,schnitzeltony/meta-openembedded,kraj/meta-openembedded,rdm-dev/meta-openembedded,RedFIR/meta-openembedded,tobw/meta-openembedded,victronenergy/meta-openembedded,sgh/meta-openembedded,tobw/meta-openembedded,cpdesign/meta-openembedded,schnitzeltony/meta-openembedded,RealDigitalMedia/meta-openembedded,schnitzeltony/meta-openembedded,tobw/meta-openembedded,openembedded/meta-openembedded,dm8tbr/kodi-wip,sesamstrasse/meta-openembedded,rofehr/meta-openembedded,martiert/meta-openembedded,kraj/meta-openembedded,RedFIR/meta-openembedded,VCTLabs/meta-openembedded,RealDigitalMedia/meta-openembedded,amery/meta-openembedded,VCTLabs/meta-openembedded,joelagnel/meta-openembedded,cpdesign/meta-openembedded,RealVNC/yocto_imx6sabreauto_meta-openembedded,MCherifiOSS/meta-openembedded,n5ac/meta-openembedded,akuster/meta-openembedded,openembedded/meta-openembedded,cpdesign/meta-openembedded,schnitzeltony/meta-openembedded,tobw/meta-openembedded,fredcadete/meta-openembedded,dongkc/meta-openembedded,openembedded/meta-openembedded,amery/meta-openembedded,joelagnel/meta-openembedded,VCTLabs/meta-openembedded,rofehr/meta-openembedded,lgirdk/meta-openembedded,schnitzeltony/meta-openembedded,lgirdk/meta-openembedded,rdm-dev/meta-openembedded,rdm-dev/meta-openembedded,sgh/meta-openembedded,martiert/meta-openembedded,shr-distribution/meta-oe,shr-distribution/meta-oe,RedFIR/meta-openembedded,trikset/meta-openembedded,lixinfnst/meta-openembedded,sgh/meta-openembedded,akuster/meta-openembedded,rehsack/meta-openembedded,sigma-embedded/elito-org.openembedded.meta,victronenergy/meta-openembedded,rofehr/meta-openembedded,rehsack/meta-openembedded,kraj/meta-openembedded,mrchapp/meta-openembedded,epylar/meta-openembedded,sigma-embedded/elito-org.openembedded.meta,kraj/meta-openembedded,martiert/meta-openembedded,akuster/meta-openembedded,openembedded/meta-openembedded,rehsack/meta-openembedded,OSSystems/meta-oe,akuster/meta-openembedded,dm8tbr/kodi-wip,amery/meta-openembedded,RealVNC/yocto_imx6sabreauto_meta-openembedded,openembedded/meta-openembedded,sigma-embedded/elito-org.ope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