Makefile: some platforms do not have hstrerror anywhere
This patch improves the logic of the test for hstrerror, not to blindly assume that if there is no hstrerror in libc that it must exist in libresolv. Signed-off-by: NGary V. Vaughan <gary@thewrittenword.com> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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