Be consistent about reporting infoclean failures.
* doc/emacs/Makefile.in (infoclean): * doc/lispintro/Makefile.in (infoclean): * doc/lispref/Makefile.in (infoclean): * doc/misc/Makefile.in (infoclean): Do not fail merely because the info directory does not exist, but do fail if it exists and can't be cleaned.
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