libavutil/error: fix build with musl toolchain
Add the feature test macro which is required for building with the musl toolchain. The feature test macro _XOPEN_SOURCE = 600 provides the XSI-compliant version of strerror_r(). Signed-off-by: Jörg Krause <jkrause@posteo.de> Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
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