[3.12] gh-117752: Autoconf: fix -fno-semantic-interposition check (GH-117789) (#117800)

Force the compiler to issue an error if the flag is not supported.
(cherry picked from commit 49fc141)

Co-authored-by: Erlend E. Aasland <[email protected]>

Author: miss-islington

configure

@@ -1778,7 +1778,7 @@ if test "$Py_OPT" = 'true' ; then
       AX_CHECK_COMPILE_FLAG([-fno-semantic-interposition],[
       CFLAGS_NODIST="$CFLAGS_NODIST -fno-semantic-interposition"
       LDFLAGS_NODIST="$LDFLAGS_NODIST -fno-semantic-interposition"
-      ])
+      ], [], [-Werror])
       ;;
   esac
 elif test "$ac_sys_system" = "Emscripten" -o "$ac_sys_system" = "WASI"; then