Log Message:
Updated libatomic_ops to 7.4.4.

== [7.4.4] 2016-05-24 ==

* Eliminate 'signed-to-unsigned value extension' compiler warning in malloc.
* Eliminate 'variable set but not used' Cppcheck warnings in test_stack.
* Fix GCC 5.x compatibility for AArch64 double-wide primitives.
* Fix makefile preventing AO_pause undefined in libatomic_ops_gpl.
* Fix missing casts to match printf format specifier in test_atomic.
* Fix missing output folder on making auto-generated test files (Automake).
* Fix typo in configure.ac (in description of AO_ASM_X64_AVAILABLE).
* Minor fix of code alignment in mips AO_compare_and_swap.
* Remove TODO file.
* Restore contribution info in ChangeLog for authors not listed in git log.
Also, includes 7.2g changes.