cpn: needs comm and MySQL at link time

The dependency on fail-comm exists not only at compile time (the
latter is due to protobuf header generation).

Change-Id: I2bae51e763d9a385bda94e77df3e88619fa28a30

src/core/cpn/CMakeLists.txt

@@ -4,6 +4,11 @@ set(SRCS
 	DatabaseCampaign.cc
 )
 
+find_package(MySQL REQUIRED)
+include_directories(${MYSQL_INCLUDE_DIR})
+
 add_library(fail-cpn ${SRCS})
+target_link_libraries(fail-cpn fail-comm ${MYSQL_LIBRARIES})
 
+# make sure protobufs are generated before we include them
 add_dependencies(fail-cpn fail-comm)