Improve accuracy of check for presence of deflateBound.
ZLIB_VERNUM isn't defined in some zlib versions, so this patch does a proper linking test in autoconf to see whether deflateBound exists in zlib. Also, setting NO_DEFLATE_BOUND will also work for folk not using autoconf. Signed-off-by: NDavid Symonds <dsymonds@gmail.com> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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