Add gcc version detect for AtomicIntTest

- Add macros for detecting gcc version inside AtomicIntTest. If gcc version
  less than 4.6.3, disable AtomicIntTest
- Return this test into build system

Open-webOS-DCO-1.0-Signed-off-by: Maksym Sditanov <msditanov@luxoft.com>

Change-Id: Ibcdb03f839b9dd1ac574efbe3f6bc92e57afc4d8
Reviewed-on: https://g2g.palm.com/2447
Reviewed-by: Build Verification
Reviewed-by: Maksym Sditanov <msditanov@luxoft.com>
Tested-by: Maksym Sditanov <msditanov@luxoft.com>
Reviewed-by: Roger Stringer <roger.stringer@lge.com>