cmake: Add -fvisibility=hidden by default. Fixes #141
cmake: Add -fvisibility=hidden by default. Fixes #141

am11/Criterion,a1lu/Criterion,Snaipe/Criterion,am11/Criterion,am11/Criterion,a1lu/Criterion,Snaipe/Criterion,Snaipe/Criterion,offa/Criterion,a1lu/Criterion,a1lu/Criterion,offa/Criterion,Snaipe/Criterion,am11/Criterion,Snaipe/Criterion,a1lu/Criterion,offa/Criterion,am11/Criterion,offa/Criterion,offa/Criterion