CMake Nightly Date Stamp
Utilities/Release: Fix name of OS X 10.6+ x86_64-only binary

In commit v3.1.0-rc1~52^2 (Make the OSX 10.6+ release x86_64 only,
2014-09-29) we forgot to remove the name "universal" from the binary
name.  Drop it now since the binary is no longer universal.

While at it, update the deployment target to actually be 10.6.
Merge topic 'osx-release-binary-name' into next

f90335ea Utilities/Release: Fix name of OS X 10.6+ x86_64-only binary
2a45da6e CMake Nightly Date Stamp