tests: fix spurious failures caused by uses of 'configure.in' Issue introduced by the recent merges of maint into master, and revealed by "make maintainer-check". * tests/aclocal-install-fail.test: Likewise. * tests/aclocal-install-mkdir.test: Likewise. * tests/aclocal-verbose-install.test: Likewise. * tests/installdir.test: Likewise. * tests/instdir-cond2.test: Likewise. * tests/instdir-no-empty.test: Likewise. * tests/python-pr10995.test: Likewise. * tests/aclocal-no-install-no-mkdir.test: Likewise. Signed-off-by: Stefano Lattarini <stefano.lattarini@gmail.com>