Added include(GNUInstallDirs)
Added include(GNUInstallDirs)

Fixes configuration not properly installed since f02cf75

taiyu-len/sway,sleep-walker/sway,colemickens/sway,crondog/sway,mikkeloscar/sway,ascent12/sway,colemickens/sway,SirCmpwn/sway,taiyu-len/sway,ascent12/sway,sleep-walker/sway,ascent12/sway,4e554c4c/sway,4e554c4c/sway,1ace/sway,1ace/sway,johalun/sway,crondog/sway,1ace/sway,taiyu-len/sway,colemickens/sway,ptMuta/sway,mikkeloscar/sway