Fixed PCRE2 beng built when CMake is configured

The bundled PCRE2 library will be built as a separate target and configuring
CMake no longer builds it. Instead, it will only be built when it is out of date.
This requires all targets to declare that they depend on the pcre2 target in
order for it to be built.

server/core/CMakeLists.txt

@@ -6,6 +6,7 @@ if(BUILD_TESTS OR BUILD_TOOLS)
     target_link_libraries(fullcore ${TCMALLOC_LIBRARIES})
   endif()
   target_link_libraries(fullcore ${CURL_LIBRARIES} utils log_manager pthread ${EMBEDDED_LIB} ${PCRE_LINK_FLAGS} ssl aio rt crypt dl crypto inih z m stdc++)
+  add_dependencies(fullcore pcre2)
 endif()
 
 add_executable(maxscale atomic.c buffer.c spinlock.c gateway.c
@@ -13,6 +14,7 @@ add_executable(maxscale atomic.c buffer.c spinlock.c gateway.c
 	poll.c config.c users.c hashtable.c dbusers.c thread.c gwbitmask.c 
 	monitor.c adminusers.c secrets.c filter.c modutil.c hint.c
 	housekeeper.c memlog.c resultset.c  gwdirs.c externcmd.c random_jkiss.c maxscale_pcre2.c)
+add_dependencies(maxscale pcre2)
 
 if(WITH_JEMALLOC)
   target_link_libraries(maxscale ${JEMALLOC_LIBRARIES})