remove policies warning, not compatible with all cmake versions

1 job for Cubix in 2 minutes and 32 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Build
failed #124201
compile

00:02:32

 
Name Stage Failure
failed
compile Build
cmake -DCMAKE_BUILD_TYPE=Debug -- -j 4 -Dcxx11=ON -DCMAKE_INSTALL_PREFIX=/builds/dudouet/gammaSoftware  ../../../LYON/gw
[gRS][[conf] DONE
[gRS][compile] ==> Start compiling the package --gw
[gRS][cmake/build -- -j 4 ] in cmakebuild/.gw_current_building_dir/gw
[gRS][compile] DONE
[gRS][install] ==> Start installing the packages --gw
[gRS][cmake/build --target install] in cmakebuild/.gw_current_building_dir/gw
[gRS][install] *** Something wrong @ installing *** --gw
ERROR: Job failed: exit code 1