Fix expression, as explain in
https://www.gnu.org/savannah-checkouts/gnu/autoconf/manual/autoconf-2.69/html_node/Generic-Declarations.html#Generic-Declarations "Unlike the other `AC_CHECK_*S' macros, when a symbol is not declared, HAVE_DECL_symbol is defined to `0' instead of leaving HAVE_DECL_symbol undeclared."
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