Fixed platform detection for libc++

git-svn-id: http://opensource.mlba-team.de/svn/xdispatch/trunk@645 9e4c620c-c391-4b63-a7fb-4924991ea895
Fix dispatch_once redefinition of xdispatch

git-svn-id: http://opensource.mlba-team.de/svn/xdispatch/trunk@646 9e4c620c-c391-4b63-a7fb-4924991ea895
Fix find_package module scripts for xdispatch, dispatch and qtdispatch to also include their dependencies

git-svn-id: http://opensource.mlba-team.de/svn/xdispatch/trunk@647 9e4c620c-c391-4b63-a7fb-4924991ea895
New code layout splitting the global include directory into the individual libraries. This hopefully fixes the issues with systems where libdispatch comes preinstalled

git-svn-id: http://opensource.mlba-team.de/svn/xdispatch/trunk@648 9e4c620c-c391-4b63-a7fb-4924991ea895
Fixed a regression with libdispatch

git-svn-id: http://opensource.mlba-team.de/svn/xdispatch/trunk@649 9e4c620c-c391-4b63-a7fb-4924991ea895
Fixed a regression within dispatch_once

git-svn-id: http://opensource.mlba-team.de/svn/xdispatch/trunk@650 9e4c620c-c391-4b63-a7fb-4924991ea895