/usr/lib/llvm-3.3/include/llvm-c is in llvm-3.3-dev 1:3.3-16ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/llvm-3.3/include/../../../include/llvm-c-3.3/llvm-c
/usr/lib/llvm-3.3/include/../../../include/llvm-c-3.3/llvm-c