As discussed on IRC, Bob has been the default (and recommended) way to build Tango for LDC for quite some time now. Support for it in the CMake-based build system just created a big maintenance burden for (almost) no benefits. Besides, the build system was currently broken anyway.
The makefiles seemed to support building *.bc libs for Tango though, which Bob probably doesn't, which might be worth keeping in mind.
Removed druntime from the repository again.. Sorry :/
Updated the druntime port a bit, now requires druntime from trunk.
Added info in runtime/README on how to get druntime from trunk.
Added patch to add LDC support to druntime.
Removed some debug logging from D2 builds.
Fixed broken typeinfo for const/invariant in D2.