[cmake] Apply compile options in add_dune_all_flags()

Package registration using dune_register_package_flags() can register compile options that need to
be enabled on a target, but add_dune_all_flags() did not apply them.

This patch fixes that omission.

cmake/modules/DuneMacros.cmake

@@ -1263,9 +1263,11 @@ macro(add_dune_all_flags targets)
   get_property(incs GLOBAL PROPERTY ALL_PKG_INCS)
   get_property(defs GLOBAL PROPERTY ALL_PKG_DEFS)
   get_property(libs GLOBAL PROPERTY ALL_PKG_LIBS)
+  get_property(opts GLOBAL PROPERTY ALL_PKG_OPTS)
   foreach(target ${targets})
     set_property(TARGET ${target} APPEND PROPERTY INCLUDE_DIRECTORIES ${incs})
     set_property(TARGET ${target} APPEND PROPERTY COMPILE_DEFINITIONS ${defs})
     target_link_libraries(${target} ${DUNE_LIBS} ${libs})
+    target_compile_options(${target} PUBLIC ${opts})
   endforeach()
 endmacro(add_dune_all_flags targets)