set_cover: cmake fixup for macos

Author: Mizux

ortools/set_cover/CMakeLists.txt

@@ -29,6 +29,7 @@ target_include_directories(${NAME} PRIVATE
   ${PROJECT_BINARY_DIR})
 target_link_libraries(${NAME} PRIVATE
   protobuf::libprotobuf
+  ${PROJECT_NAMESPACE}::math_opt_proto
   ${PROJECT_NAMESPACE}::ortools_proto)
 #add_library(${PROJECT_NAMESPACE}::set_cover ALIAS ${NAME})