Cater to the fact that g++ 4.3 will use a different naming for

    Cater to the fact that g++ 4.3 will use a different naming for
        the global constructor suffix in shared and static objects.
        * m4/c++-constructors.m4 (CL_GLOBAL_CONSTRUCTORS): Add test for
        the global constructor suffix, define CL_GLOBAL_CONSTRUCTOR_SUFFIX_PIC
        and CL_GLOBAL_CONSTRUCTOR_SUFFIX_NOPIC appropriately.
        * include/cln/config.h.in: Provide templates to be filled in by
        configure.
        * include/cln/modules.h (CL_PROVIDE, CL_REQUIRE): Use
        CL_GLOBAL_CONSTRUCTOR_SUFFIX_PIC, CL_GLOBAL_CONSTRUCTOR_SUFFIX_NOPIC.