Revert libtool-2.5.1 experiment. Gettext now uses libtool-2.5.3. #68

Job	Run time
build-tarball	29m 8s
make check on Alpine Linux	37m 27s
make check on Cygwin (64)	1h 56m 50s
make check on AlmaLinux GNU/Linux	12m 14s
make check on FreeBSD	9m 21s
make check on CentOS GNU/Linux	5m 35s
make check on Ubuntu GNU/Linux	31m 55s
make check on mingw (32)	1h 10m 3s
make check on macOS (macos-12)	48m 0s
make check on mingw (64)	1h 15m 6s
make check on macOS (macos-13)	54m 42s
make check on MSVC (32)	59m 27s
make check on macOS (macos-14)	21m 57s
make check on NetBSD	28m 34s
make check on MSVC (64)	1h 1m 4s
make check on macOS (macos-15)	22m 50s
make check with the newest clang release	18m 57s
make check on OpenBSD	42m 28s
make check on Solaris 11	1h 2m 37s
make check on Solaris 11 OmniOS	56m 9s
make check with sanitizers	11m 28s
	14h 35m 52s

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