Using " rather than < for header files in Emacs

[Wilfred Hughes]

I've noticed that it's common for Emacs C code to say:

#include <config.h>

or

#include <c-ctype.h>

even though these headers are from Emacs source, not system headers.
Are we interested in fixing this? I.e. to write

#include "config.h"

I've attached an example patch.

c_include_formatting.diff
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