[cmake] add allpackage flags to created libs

cmake/modules/DunePybindxiHelper.cmake

 function(dune_pybindxi_add_helper_lib target_name)
+  message(WARNING "dune_pybindxi_add_helper_lib is deprecated. Add source to bindings lib directly")
   add_library(${target_name} EXCLUDE_FROM_ALL ${ARGN})
   target_include_directories(${target_name}
     PRIVATE ${PYBIND11_INCLUDE_DIR}

cmake/modules/DunePybindxiMacros.cmake

@@ -40,4 +40,3 @@ endif()
 
 include(DunePybindxiUtils)
 include(DunePybindxiHelper)
-

cmake/modules/DunePybindxiUtils.cmake

@@ -167,4 +167,11 @@ function(dune_pybindxi_add_module target_name)
     # needed for bigger binding projects due to the limit to 64k addressable sections
     target_compile_options(${target_name} PRIVATE /MP /bigobj)
   endif()
+
+  add_dune_all_flags(${target_name})
+  if(DUNE_XT_WITH_PYTHON_BINDINGS)
+    add_custom_target(bindings ALL DEPENDS ${target_name})
+  else()
+    add_custom_target(bindings DEPENDS ${target_name})
+  endif()
 endfunction()