patch 9.1.0693: Configure doesn't show result when not using python3 stable abi

Problem:  Configure doesn't show result when not using python3 stable
          abi (after v9.1.0691)
Solution: Add back AC_MSG_RESULT() (Ken Takata)

related: #15555

Signed-off-by: Ken Takata <kentkt@csc.jp>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/configure.ac b/src/configure.ac
index abd0c44..233e907 100644
--- a/src/configure.ac
+++ b/src/configure.ac
@@ -1549,7 +1549,8 @@
      else
        vi_cv_var_python3_stable_abi="$withval"
      fi
-     AC_MSG_RESULT($vi_cv_var_python3_stable_abi)])
+     AC_MSG_RESULT($vi_cv_var_python3_stable_abi)],
+     AC_MSG_RESULT(no))
       if test "X$vi_cv_var_python3_stable_abi" != "X"; then
         AC_CACHE_VAL(vi_cv_var_python3_stable_abi_hex,
         [