cmake: fix hwdocs' install path
cmake: fix hwdocs' install path

karolherbst/envytools,MoochMcGee/envytools,hakzsam/envytools,MoochMcGee/envytools,grate-driver/envytools,kfractal/envytools,envytools/envytools,MoochMcGee/envytools,karolherbst/envytools,karolherbst/envytools,envytools/envytools,grate-driver/envytools,grate-driver/envytools,karolherbst/envytools,grate-driver/envytools,hakzsam/envytools,pierremoreau/envytools,kfractal/envytools,envytools/envytools,hakzsam/envytools,pierremoreau/envytools,envytools/envytools,kfractal/envytools,MoochMcGee/envytools,MoochMcGee/envytools,pierremoreau/envytools,hakzsam/envytools,hakzsam/envytools,envytools/envytools,kfractal/envytools,pierremoreau/envytools,grate-driver/envytools,karolherbst/envytools,kfractal/envytools,pierremoreau/envytools