The openssl rehash command is not available on some platforms including
Windows. This change skips the associated tests if rehash is not available.
Reviewed-by: Richard Levitte <levitte@openssl.org>
If test/recipes/40-test_rehash.t is executed as root, the last test
will fail, since the created directory will remain writable no matter
what. Make sure it complains loudly about being run as root.
Reviewed-by: Rich Salz <rsalz@openssl.org>