build: New configure option --with-libtool-modification.
* Makefile.am (EXTRA_DIST): Add build-aux/libtool-patch.sed. * build-aux/libtool-patch.sed: New. * configure.ac (--with-libtool-modification): New. * build-aux/ltmain.sh: Revert our own local modification.
- Fixes-commit: f88eb9e98f491b503f46c7d995c9651f1e46b9e9
- GnuPG-bug-id: T6619
- Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>