Update Finduuid.cmake to work on macOS
Update Finduuid.cmake to work on macOS

On macOS there is no need for libuuid.so, the functions are provided
by the kernel, and the header comes with the OS. The updated file
only looks for a libuuid.so if it is needed.

cern-it-sdc-id/davix,cern-it-sdc-id/davix,cern-it-sdc-id/davix,cern-it-sdc-id/davix