[PATCH] Add customizable clang-format options variable

[Syohei Yoshida via cfe-commits]

Hi.

At r249567, '-sort-includes' option is set to clang-format-region
command in clang-format.el. This option can be used only with
development version clang-format. and users get error if they use old
version clang-format. And I suppose clang-format options should not be
hard corded and should be customizable.

This attached patch adds customize variable about clang-format options
and its default value is '("-sort-includes") if users use clang-format
3.8 or higher, while it is nil if not.

Regards.

See also
  - https://github.com/syl20bnr/spacemacs/issues/3408 (older
clang-format user's issue)

-- 
Syohei YOSHIDA(syohex at gmail.com)
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