[fix] build/myocamlbuild_prefix.ml: Correct the sed for FreeBSD 7.x. #59
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[fix] build/myocamlbuild_prefix.ml: FreeBSD 8.x and above have added -r in its sed that does exactly same as -E for increased compatibility with GNU sed. Since FreeBSD still supports 7.x that its sed does not has -r, so use -E instead.