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util/log: Fix log messages over 1024 characters.

Emma Anholt requested to merge anholt/mesa:util-log into main

The first attempt at the sprintf would have consumed part of va, so if we're going to recurse on overflow to try again in a new allocation then we have to do our work on a copy.

This was a common failure mode for MESA_GLSL=source, where it would just print:

Mesa: info: GLSL source for fragment shader 1: Mesa: info: (null)

Fixes: 7a18a171 ("util/log: improve logger_file newline handling") @olv

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