Makefile.DOS.template (info_TEXINFOS): Remove unused variable.

Makefile.DOS.template (info_TEXINFOS): Remove unused variable.
(TEXINFOS): Value changed to `doc/make.texi'.
(.SUFFIXES): Use .texi instead of .texinfo.
(make.info, make.dvi): Depend on doc/make.texi.
(.texi.info): New target, instead of ".texinfo.info".  Change -I switch
to $(MAKEINFO) to look in doc/.  Use --no-split.
(.texi): New target, instead of ".texinfo".  Change -I switch to $(MAKEINFO)
to look in doc/.  Use --no-split.
(.texi.dvi): New target, instead of ".texinfo.dvi".  Change -I switch
to $(MAKEINFO) to look in doc/.
(install-info-am, uninstall-info): Don't look for "*.i[0-9]" and
"*.i[0-9][0-9]" (due to --no-split above).
(noinst_TEXINFOS, TEXI2HTML, TEXI2HTML_FLAGS): New variables.
(html, make_1.html): New targets.
(.PHONY): Add "html".
(.SUFFIXES): Add .html.