Merge pull request #5582
4caad26 depends: bump cctools to a custom version with less deps (Cory Fields)
46f54bf build: osx builders no longer need 32bit compiler support (Cory Fields)
4fe6c3c depends: major upgrade to darwin toolchain (Cory Fields)
ec90c97 depends: osx: fix qt5 build against 10.10 sdk (Cory Fields)