src/CMakeLists.txt: Fix non-apple link-libraries
src/CMakeLists.txt: Fix non-apple link-libraries

cmake complained:

 CMake Warning (dev) at src/CMakeLists.txt:10 (target_link_libraries):
 Cannot specify link libraries for target "rt" which is not built by this
 project.

 CMake does not support this but it used to work accidentally and is being
 allowed for compatibility.

 Policy CMP0016 is not set: target_link_libraries() reports error if its
 only argument is not a target.  Run "cmake --help-policy CMP0016" for
 policy details.  Use the cmake_policy command to set the policy and
 suppress this warning.

evnu/unionfs-fuse,yogoloth/unionfs-fuse,kissthink/unionfs-fuse-1,evnu/unionfs-fuse,kissthink/unionfs-fuse-1,evnu/unionfs-fuse,kissthink/unionfs-fuse-1,yogoloth/unionfs-fuse,yogoloth/unionfs-fuse