cmake: use keyword signature of target_link_libraries

src/CMakeLists.txt

@@ -16,6 +16,6 @@ foreach(_program ${programs})
   add_executable(${_program} ${_program}.cc)
   target_link_dune_default_libraries(${_program})
   add_dune_pythonlibs_flags(${_program})
-  target_link_libraries(${_program} tinyxml2)
+  target_link_libraries(${_program} PUBLIC tinyxml2)
 #  target_compile_options(${_program} PRIVATE "-fpermissive")
 endforeach()