openscap: Link to CAP_LIBRARIES if found
openscap: Link to CAP_LIBRARIES if found

This fixes undefined reference errors when libcap libraries
found in the system
../../../../src/libopenscap.so.25.0.0: undefined reference to
`cap_get_flag'
 undefined reference to `cap_get_pid'
 undefined reference to `cap_free'
 undefined reference to `cap_to_name'

redhatrises/openscap,OpenSCAP/openscap,redhatrises/openscap,OpenSCAP/openscap,redhatrises/openscap,redhatrises/openscap,redhatrises/openscap,OpenSCAP/openscap,OpenSCAP/openscap,OpenSCAP/openscap,redhatrises/openscap,OpenSCAP/openscap