printed $CXX at the end of script

git-svn-id: svn://bind10.isc.org/svn/bind10/branches/trac365@3381 e5f2f494-b856-4b98-b285-d166d9295462

configure.ac

@@ -592,6 +592,8 @@ Package:
   Name:          $PACKAGE_NAME
   Version:       $PACKAGE_VERSION
 
+C++ Compiler:    $CXX
+
 Flags:
   DEFS:          $DEFS
   CPPFLAGS:      $CPPFLAGS