configure: Mark conftest variable as unused to pass test with -Werror
When using -Werror, the warning for the unused variable would let the test fail, even if in6addr_any is available.
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@ -609,7 +609,7 @@ AC_COMPILE_IFELSE(
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[[#include <sys/types.h>
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#include <sys/socket.h>
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#include <netinet/in.h>]],
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[[struct in6_addr in6;
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[[struct in6_addr in6 __attribute__((unused));
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in6 = in6addr_any;]])],
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[AC_MSG_RESULT([yes]);
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AC_DEFINE([HAVE_IN6ADDR_ANY], [], [have struct in6_addr in6addr_any])],
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