bug#73620: libtool-2.5.3 broken on CentOS and Alma Linux

Hi,

I wrote:
> This week, I upgraded to libtool-2.5.3, and what I see is that most
> unit tests fail on CentOS 7 and Alma Linux 9, i.e. both RHEL compatible
> distros.

When I revert the ltmain.in change from commit
0e1b33332429cd578367bd0ad420c065d5caf0ac,
things work again.

Bruno