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Remove obsolete a.out linker test.  It contains an implicit
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function declaration, leading to false positives.
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Submitted upstream:
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  <https://lists.gnu.org/archive/html/emacs-devel/2022-12/msg01019.html>
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diff --git a/configure.ac b/configure.ac
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index 660784347bbc0dcd..cc390d40b33a1d8f 100644
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--- a/configure.ac
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+++ b/configure.ac
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@@ -2493,39 +2493,6 @@ if test "${HAVE_X11}" = "yes"; then
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     export LD_RUN_PATH
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   fi
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-  if test "${opsys}" = "gnu-linux"; then
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-    AC_CACHE_CHECK([whether X on GNU/Linux needs -b to link], [emacs_cv_b_link],
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-    [AC_LINK_IFELSE([AC_LANG_PROGRAM([[]],
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-     [[XOpenDisplay ("foo");]])],
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-     [xgnu_linux_first_failure=no],
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-     [xgnu_linux_first_failure=yes])
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-    if test "${xgnu_linux_first_failure}" = "yes"; then
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-      OLD_CPPFLAGS="$CPPFLAGS"
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-      OLD_LIBS="$LIBS"
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-      CPPFLAGS="$CPPFLAGS -b i486-linuxaout"
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-      LIBS="$LIBS -b i486-linuxaout"
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-      AC_LINK_IFELSE([AC_LANG_PROGRAM([[]],
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-       [[XOpenDisplay ("foo");]])],
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-       [xgnu_linux_second_failure=no],
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-       [xgnu_linux_second_failure=yes])
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-      if test "${xgnu_linux_second_failure}" = "yes"; then
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-	# If we get the same failure with -b, there is no use adding -b.
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-	# So leave it out.  This plays safe.
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-        emacs_cv_b_link=no
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-      else
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-        emacs_cv_b_link=yes
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-      fi
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-      CPPFLAGS=$OLD_CPPFLAGS
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-      LIBS=$OLD_LIBS
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-    else
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-      emacs_cv_b_link=no
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-    fi])
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-    if test "x$emacs_cv_b_link" = xyes ; then
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-      LD_SWITCH_X_SITE="$LD_SWITCH_X_SITE -b i486-linuxaout"
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-      C_SWITCH_X_SITE="$C_SWITCH_X_SITE -b i486-linuxaout"
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-    fi
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-  fi
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-
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   # Reportedly, some broken Solaris systems have XKBlib.h but are missing
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   # header files included from there.
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   AC_CACHE_CHECK([for Xkb], [emacs_cv_xkb],