[PATCH] Add format attribute for buffer_printf functions

[Kevin J. McCarthy]

On Wed, Apr 10, 2019 at 07:44:45PM -0400, aaron+mutt at schrab.com wrote:
>Let compilers know that `mutt_buffer_printf()` and
>`mutt_buffer_add_printf()` expect the second argument to be a
>`printf`-style format string with the arguments for the format starting
>at the third argument. This allows warnings to be shown if these are
>incorrect.

AKAIK this is a GCC extension.  Mutt thus far has tried to remain 
compiler agnostic, so I'm -0 to this.

-- 
Kevin J. McCarthy
GPG Fingerprint: 8975 A9B3 3AA3 7910 385C  5308 ADEF 7684 8031 6BDA
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