Target "HMPIDBase" links to itself

[aphecetche]

Just updated to latest dev and got this warning :

[cmake] Configuring done
[cmake] CMake Warning (dev) at cmake/O2Utils.cmake:271 (Add_Library):
[cmake] Policy CMP0038 is not set: Targets may not link directly to themselves.
[cmake] Run "cmake --help-policy CMP0038" for policy details. Use the cmake_policy
[cmake] command to set the policy and suppress this warning.
[cmake]
[cmake] Target "HMPIDBase" links to itself.
[cmake] Call Stack (most recent call first):
[cmake] Detectors/HMPID/base/CMakeLists.txt:16 (O2_GENERATE_LIBRARY)
[cmake] This warning is for project developers. Use -Wno-dev to suppress it.
[cmake]
[cmake] Generating done

I guess it was introduced in #1231

[sawenzel]

Fixed.