Fixing build for many GCC versions...
Actually, it seems that not only GCC 4.7 and 4.8 need this, but also
4.9 and (dunno why) 4.6 (? maybe for Arch bleeding-edge binutils?)
This check fix the problem.

Change-Id: Ic65876b99318a34bfea46aed9e76129f697a49b2