Lie about futex_atomic_cmpxchg_inatomic kernel support.

Lie about futex_atomic_cmpxchg_inatomic kernel support.

In past versions of glibc, we incorrectly assumed all ARM kernels
in all configurations supported futex_atomic_cmpxchg_inatomic. This
was clearly a lie, however it was a lie that we relied on, because
the fallback implementation appears to not play nicely with certain
applications like pulseaudio.  Restore the lie for kernels > 2.6.32
and plug our ears and scream "LA LA LA" about how wrong this is.

Author: Adam Conrad <adconrad@ubuntu.com>
Bug-Ubuntu: https://launchpad.net/bugs/1436162
Last-Update: 2015-03-25

Change-Id: I9c2bfb363520ac86d5d66cedd013e32c95f05bc5
Signed-off-by: Dongkyun, Son <dongkyun.s@samsung.com>