We have to have these beneath the folder where ycm_core.so is placed so that we
get fast completions. If these files are not here, then clang fails to
precompile a file preamble and completions are slow.
Clang searches for these files and if it doesn't find them, completion is twice
as slow (or slower) than otherwise.
See this issue report for more details:
https://github.com/Rip-Rip/clang_complete/issues/17