Consistently use gcc's __attribute__((format)) to check sprintf-style

Tom Lane <tgl@sss.pgh.pa.us>

Commit: fcd2e372a77ae5186e80aee20844621139fdf33c
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2001-10-03T21:58:28Z
Releases: 7.2.1
Consistently use gcc's __attribute__((format)) to check sprintf-style
format strings wherever possible.  Remarkably, this exercise didn't
turn up any inconsistencies, but it seems a good idea for the future.

Files