Multiple 'make uninstall' should not fail even for TEXINFOS. * lib/am/texinfos.am (uninstall-info-am): Do not fail due to install-info if the installed file does not exist (any more). * tests/txinfo26.test: Issue multiple `make uninstall'. * tests/instmany-mans.test: Likewise. * tests/instmany-python.test: Likewise. * tests/instmany.test: Likewise. * tests/txinfo26.test: Likewise. * NEWS: Update. Signed-off-by: Ralf Wildenhues <Ralf.Wildenhues@gmx.de>