Add missing include needed by rpdutil

The rpdutil target currently relies on ${CMAKE_BINARY_DIR}/include
being added as a directory property as a side-effect of the call to
ROOT_LINKER_LIBRARY(SrvAuth).

net/rpdutils/CMakeLists.txt

@@ -31,6 +31,7 @@ add_library(rpdutil STATIC
   src/rpdutils.cxx
 )
 
+target_include_directories(rpdutil PRIVATE ${CMAKE_BINARY_DIR}/include)
 target_link_libraries(rpdutil INTERFACE $<$<PLATFORM_ID:Linux>:crypt>)
 set_property(TARGET rpdutil PROPERTY POSITION_INDEPENDENT_CODE ON)
 add_dependencies(rpdutil move_headers)