DON'T MERGE: Revert "perf bench: Add futex-* microbenchmark"

This enables building of perf with non-NPTL toolchain.

Reverts:
 1. perf bench: Add futex-hash microbenchmark
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/tools/perf/bench?id=a043971141f163f9845324a2f83502d15011485d

 2. perf bench: Add futex-wake microbenchmark
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/tools/perf/bench?id=27db78307481dbba68c5f3563c6cb694b25521d9

 3. perf bench: Add futex-requeue microbenchmark
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/tools/perf/bench?id=0fb298cf95c0d8119557b7d4657724a146e0622e

Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>