Fix doc/*/makefile.w32-in according to r102953-r102956.

Fix doc/*/makefile.w32-in according to r102953-r102956.

 doc/lispref/makefile.w32-in (texinfodir): New variable.
 (usermanualdir): Remove as redundant with $(emacsdir).
 (MAKEINFO): Remove options, leave only program name.
 (MAKEINFO_OPTS): New variable.
 (texinputdir, $(infodir)/elisp): Use $(MAKEINFO_OPTS).
 doc/emacs/makefile.w32-in (MAKEINFO): Remove options, leave only program name.
 (MAKEINFO_OPTS): New variable.
 (ENVADD, $(infodir)/emacs): Use $(MAKEINFO_OPTS).
 (emacs.html): New target.
 (clean): Remove emacs.html.
 doc/misc/makefile.w32-in (MAKEINFO): Remove options, leave only program name.
 (MAKEINFO_OPTS): New variable.
 (ENVADD, $(infodir)/emacs): Use $(MAKEINFO_OPTS).
 ($(infodir)/info, $(infodir)/ccmode, $(infodir)/ada-mode)
 ($(infodir)/pcl-cvs, $(infodir)/eshell, $(infodir)/cl)
 ($(infodir)/dbus, $(infodir)/dired-x, $(infodir)/ediff)
 ($(infodir)/flymake, $(infodir)/forms, $(infodir)/gnus)
 ($(infodir)/message, $(infodir)/emacs-mime, $(infodir)/sieve)
 ($(infodir)/pgg, $(infodir)/mh-e, $(infodir)/reftex)
 ($(infodir)/remember, $(infodir)/sasl, $(infodir)/sc)
 ($(infodir)/vip, $(infodir)/viper, $(infodir)/widget)
 ($(infodir)/efaq, $(infodir)/autotype, $(infodir)/calc)
 ($(infodir)/idlwave, $(infodir)/eudc, $(infodir)/ebrowse)
 ($(infodir)/woman, $(infodir)/speedbar, $(infodir)/tramp)
 ($(infodir)/ses, $(infodir)/smtpmail, $(infodir)/org)
 ($(infodir)/url, $(infodir)/newsticker, $(infodir)/nxml-mode)
 ($(infodir)/rcirc, $(infodir)/erc, $(infodir)/ert)
 ($(infodir)/epa, $(infodir)/mairix-el, $(infodir)/auth)
 ($(infodir)/eieio, $(infodir)/ede, $(infodir)/semantic)
 ($(infodir)/edt): Use $(MAKEINFO_OPTS).