Automake used to implement an undocumented hack causing '.info' files
that appeared to be cleaned (by e.g. being listed in the CLEANFILES
variable) to also be built in the builddir rather than in the srcdir;
this was for backward compatibility with packages such as Texinfo,
which did things like:
This solves spurious failure in the 'check-no-trailing-backslash-in-recipes'
target for Automake-NG.
This is basically a backport of Automake-NG commit v1.14.1-1010-g85aae58;
the point is to minimize the amount of spurious diffs between the mainline
Automake and the Automake-NG source trees.
* t/
