Libsodium is now required if and only if --with-libsodium is used #913
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This patch is proposed for #912. If a user specifies that they want libzmq built with libsodium, and the requirement cannot be satisfied, we should error at the user so they can either A) install libsodium to a reasonable location or B) relax their requirement for libsodium support.
Previously a warning was issued in this case, causing users who wanted libsodium support not to get it, which may be discovered at a much later time when their programs didn't work as expected.
I release this patch under the LGPL v3 or any later version.