Proper OSX/CLANG/CXX11 support in stl_delete.h
- replaces fix in 066df0d218ee4391eb3e15259deca5ccc190ed84
- Check if _LIBCPP_VECTOR is defined for vector_delete.
  This is defined in libc++'s headers which Apple is using
  instead of libstdc++
Cast param for std::time to a pointer of time_t
- bleeding clang (trunk 186535 v3.4) fails here
Return an empty string instead of a bool
Merge branch 'clang-rebased' of https://github.com/axetota/ardour