* lib/am/texinfos.am (install-info-am, uninstall-info-am): Install DJGPP-style *.iNN info files. (maintainer-clean-aminfo): Rewrite using the same pattern as in uninstall-info-am. * lib/am/texibuild.am (%SOURCE_SUFFIX%%DEST_SUFFIX%): Erase DJGPP-style *.iNN info files before running $(MAKEINFO). * tests/txinfo19.test: New file. * tests/Makefile.am (TESTS): Add txinfo19.test.