Update m4 macros and libtool patches (from YAXT)

contrib/00nagfor-libtool-patch/nagfor-libtool-2.4.7.patch

contrib/06ltmain_nag_pthread-patch/ltmain_nag_pthread.patch

m4/acx_assert_lang_is_fortran_variant.m4

m4/acx_c_package.m4

m4/acx_cfortran_flags.m4

m4/acx_check_cfortran.m4

m4/acx_fortran_check_include.m4

m4/acx_fortran_package.m4

m4/acx_lang_c_check_include.m4

m4/acx_lang_check_include.m4

m4/acx_lang_fortran_check_include.m4

m4/acx_lang_package.m4

m4/acx_lt_problems.m4

m4/acx_m4_list_to_quoted_strings.m4

m4/acx_mpirun.m4

m4/acx_mv_obj.m4

m4/acx_option_search_libs.m4

m4/acx_sl_fc_mod_path_flag.m4

m4/acx_sl_mod_suffix.m4

m4/acx_use_libtool_configuration.m4