Changing mkinstalldirs to avoid using mkdir -p

[Nathanael Nerode]

This came up while working on GCC.  I'd like to offer this patch to
mkinstalldirs so that it works as expected.  Also, GCC would prefer that any
local changes get upstream.  :-)

If I need to do anything special copyright-wise, let me know.  Alternatively,
rather than commenting the stuff out, you could just delete it, which would
obviate all copyright issues.

-- 
Nathanael Nerode  <neroden at gcc.gnu.org>
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mkinstalldirs.diff
Description: Text document