build: Fix libtool modification.
* build-aux/ltmain.sh: Fix reverting mistake. * build-aux/libtool.patch: Regenerate and fix whitespace mistake. * configure.ac [x86_64-*mingw32*] (libtool-patch): Exit when failed.
- Fixes-commit: c1d3f5952f621a553c122cee7a20e990d982a715
- Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>