[Intel-gfx] [PATCH i-g-t] lib/igt_core: Move write_stderr out of LIBUNWIND ifdef

[Chris Wilson]

Quoting Arkadiusz Hiler (2017-11-24 10:32:07)
> write_stderr() and __write_stderr() are defined behind ifdef on
> HAVE_LIBUNWIND, but do no depend on the lib in any way.

Hmm, we keep getting caught out by large ifdefs. Although I guess
conditionally enabled code itself is less-than-welcome, we should
probably aim to make whole C files be conditionally compiled, exporting
no-op interfaces when not enabled. Just a thought.
-Chris