configure: display sysconfdir in summary

Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
diff --git a/configure b/configure
index b2edb37..46b8e39 100755
--- a/configure
+++ b/configure
@@ -2015,6 +2015,7 @@
 echo "Install prefix    $prefix"
 echo "BIOS directory    `eval echo $datadir`"
 echo "binary directory  `eval echo $bindir`"
+echo "config directory  `eval echo $sysconfdir`"
 if test "$mingw32" = "no" ; then
 echo "Manual directory  `eval echo $mandir`"
 echo "ELF interp prefix $interp_prefix"