update/replace a subset of m4 macros and Libtool patches (copy from the YAXT project)

autogen.sh

contrib/00nagfor-libtool-patch/README.txt

contrib/00nagfor-libtool-patch/nagfor-libtool-2.4.2.patch

contrib/00nagfor-libtool-patch/nagfor-libtool-2.4.6.patch

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

contrib/05macos-nagfor-patch/macos-nagfor.patch

contrib/06ltmain_nag_pthread-patch/ltmain_nag_pthread.patch

m4/acx_use_libtool_configuration.m4

m4/kpse_libtool.m4

patch/libtool.m4.arg_spaces.patch