Improve YCM contrib: Fix 'no newline at end of file' issue.

Problem:  YCM was reporting a much disturbing warning about a missing
          newline at the end of some files. This was odd, as the
          newlines were there and the warning only was shown for some
          files, not for all of them.
Cause:    After discussing this issue with @Valloric (see
          https://github.com/Valloric/YouCompleteMe/issues/950), it
          turned out that not YCM, but libclang is responsible for it.
          This is, same compilation flags that produce no warnings with
          clang-the-binary on the command line, do produce them with
          libclang-the-library when used by YCM.
Solution: Add an extra flag (-Wno_newline_eof) to those extracted from
          configuration database before passing them to YCM.

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