patch format

[Bernardo Innocenti]

Hello,

I noticed the documentation still says the preferred format for patches
is "diff -cp3", but I see several postings on gcc-patches in unified
format (diff -up).

Since the latter is much more readable and more widely used in other
projects, I wanted to check if it's ok to use it despite what the
current documentation for contributions says.

-- 
  // Bernardo Innocenti - Develer S.r.l., R&D dept.
\X/  http://www.develer.com/

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