utils/mkdir-p: check if dir exists also after mkdir failed
with "make install -j8" it happens very often that two or more make instances are creating the same directory in parallel. As a result one instace creates the directory and second mkdir fails because the directory exists already (but it did not while testing for it earlier). Signed-off-by: Sebastian Andrzej Siewior <sebastian@breakpoint.cc> Reviewed-by: Matt Caswell <matt@openssl.org> Reviewed-by: Rich Salz <rsalz@openssl.org> (Merged from https://github.com/openssl/openssl/pull/1204)
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