CMake: search for gethostbyaddr() in libnetwork

(cherry picked from commit bdece16)

Author: davidkaroly

CMakeLists.txt

@@ -389,7 +389,12 @@ else(WIN32)
             if(LIBNSL_HAS_GETHOSTBYADDR)
                 set(TCPDUMP_LINK_LIBRARIES ${TCPDUMP_LINK_LIBRARIES} nsl)
             else(LIBNSL_HAS_GETHOSTBYADDR)
-                message(FATAL_ERROR "gethostbyaddr is required, but wasn't found")
+                check_library_exists(network gethostbyaddr "" LIBNETWORK_HAS_GETHOSTBYADDR)
+                if(LIBNETWORK_HAS_GETHOSTBYADDR)
+                    set(TCPDUMP_LINK_LIBRARIES ${TCPDUMP_LINK_LIBRARIES} network)
+                else(LIBNETWORK_HAS_GETHOSTBYADDR)
+                    message(FATAL_ERROR "gethostbyaddr is required, but wasn't found")
+                endif(LIBNETWORK_HAS_GETHOSTBYADDR)
             endif(LIBNSL_HAS_GETHOSTBYADDR)
         endif(LIBSOCKET_HAS_GETHOSTBYADDR)
     endif(NOT STDLIBS_HAVE_GETHOSTBYADDR)