Minor doc Makefile.in clean-up.
* doc/emacs/Makefile.in (SHELL): Set it. (INFO_TARGETS, DVI_TARGETS): Remove variables. (info, dvi): Replace above variables with their expansions. (info): Move mkdir from here... ($(infodir)/emacs): ... to here (for parallel builds). (pdf): New target. ($(infodir)/emacs): Pass -o option to makeinfo. (.PHONY): Declare clean rules. (maintainer-clean): Delete dvi and pdf files. Guard against cd failures. Use a more restrictive delete. * doc/lispref/Makefile.in (dvi, pdf, $(infodir)): New targets. ($(infodir)/elisp): Ensure target directory exists. Use $@. (clean): No 'make.out' or 'core' files. (.PHONY): Declare clean rules. (maintainer-clean): Delete pdf file. Guard against cd failures.
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