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Allison Karlitskaya authored
Commit 22e7fc34 introduced a regression: futexes were always disabled and the emulated codepath was always being used. That commit was in response to an originally buggy implementationt hat wrote junk into config.h (but happened to be working properly). Fix up the mess and while we're at it, close bug #631231 by including syscall.h from the correct location and using __NR_futex instead of SYS_futex. Closes #631231.
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