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With glibc 2.20 (and newer), defining _BSD_SOURCE (only)
will now generate compiler warnings similar to:

/usr/include/features.h:148:3: warning: #warning "_BSD_SOURCE
and _SVID_SOURCE are deprecated, use _DEFAULT_SOURCE" [-Wcpp]

See the glibc 2.20 release notes, https://lwn.net/Articles/611162/

.

This patch adds the required _DEFAULT_SOURCE.
Signed-off-by: Bernhard Nortmann <bernhard.nortmann@web.de>
Acked-by: Siarhei Siamashka <siarhei.siamashka@gmail.com>