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Test for the existence of the GNU extension getaddrinf_a and libanl instead of assuming that every Linux has it. Fall back to posix variant if they are missing. This fixes build with musl libc which does not implement this GNU extension. Fixes #19320 Signed-off-by: Natanael Copa <ncopa@alpinelinux.org> Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>
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