tests/.../Makefile.am avoid redundant linkage with librt

The librt is required for old glibc < 2.17 to get clock_gettime().
Since we do check the availability of this function libosmocore
and conditionally link it against librt, there is no need to do
such unconditional and redundant linkage here.

Change-Id: If587d16d2db677b97e3a0641027eb735af9c9c30
2 files changed