server: Fix compilation on systems with a two-argument sched_setaffinity prototype. (try 2)

[Andrew Nguyen]

The failure to define _GNU_SOURCE before including sched.h makes the 
configure check useless.
---
 configure.ac    |   11 +++++++++++
 server/thread.c |    4 ++++
 2 files changed, 15 insertions(+), 0 deletions(-)


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