Patch for clang-format to allow references and pointers to bind differently

[Ben Longbons]

This patch allows the whitespace attachment for pointers and
references to be different:

void pc(char *c);
void rc(char& c);
void prc(char *& c);

A full set of expected outputs for each: https://gist.github.com/o11c/7506460

Note: the formatting in the patch is not optimal, I preferred to make
the diff more readable in the initial submission.

-o11c

P.S. Please make sure to reply-all, I'm not subscribed (I hate the
"all or nothing" aspect of mailing lists).
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