bpo-34448: Improve output of usable wchar_t check (GH-8846)

diff --git a/configure b/configure
index 4de6843..0b07f0b 100755
--- a/configure
+++ b/configure
@@ -14600,19 +14600,21 @@
 $as_echo "$ac_cv_wchar_t_signed" >&6; }
 fi
 
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether wchar_t is usable" >&5
+$as_echo_n "checking whether wchar_t is usable... " >&6; }
 # wchar_t is only usable if it maps to an unsigned type
 if test "$ac_cv_sizeof_wchar_t" -ge 2 \
           -a "$ac_cv_wchar_t_signed" = "no"
 then
-  HAVE_USABLE_WCHAR_T="yes"
 
 $as_echo "#define HAVE_USABLE_WCHAR_T 1" >>confdefs.h
 
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
+$as_echo "yes" >&6; }
 else
-  HAVE_USABLE_WCHAR_T="no usable wchar_t found"
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
 fi
-{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $HAVE_USABLE_WCHAR_T" >&5
-$as_echo "$HAVE_USABLE_WCHAR_T" >&6; }
 
 # check for endianness
  { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether byte ordering is bigendian" >&5