[glibmm] Fix the make check build with --enable-warnings=fatal.

[Murray Cumming <murrayc src gnome org>]

commit 2d080efccf60a203cd880f4a7b5acaa6317cfef2
Author: Murray Cumming <murrayc murrayc com>
Date:   Tue Feb 8 11:02:29 2011 +0100

    Fix the make check build with --enable-warnings=fatal.
    
    * examples/options/main.cc: Comment-out unused method parameters.

 ChangeLog                |    6 ++++++
 examples/options/main.cc |    6 +++---
 2 files changed, 9 insertions(+), 3 deletions(-)
---
diff --git a/ChangeLog b/ChangeLog
index f6fd1d8..0a20cec 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2011-02-08  Murray Cumming  <murrayc murrayc com>
+
+	Fix the make check build with --enable-warnings=fatal.
+	
+	* examples/options/main.cc: Comment-out unused method parameters.
+
 2011-02-06  Kjell Ahlstedt  <kjell ahlstedt bredband net>
 
 	OptionGroup: An on_post_parse() override need not call the base class.
diff --git a/examples/options/main.cc b/examples/options/main.cc
index 64166c8..0ba5372 100644
--- a/examples/options/main.cc
+++ b/examples/options/main.cc
@@ -80,7 +80,7 @@ ExampleOptionGroup::ExampleOptionGroup()
   add_entry(entry_remaining, m_remaining_list);
 }
 
-bool ExampleOptionGroup::on_pre_parse(Glib::OptionContext& context, Glib::OptionGroup& group)
+bool ExampleOptionGroup::on_pre_parse(Glib::OptionContext& /* context */, Glib::OptionGroup& /* group */)
 {
   //This is called before the m_arg_* instances are given their values.
   // You do not need to override this method. This is just here to show you how,
@@ -89,7 +89,7 @@ bool ExampleOptionGroup::on_pre_parse(Glib::OptionContext& context, Glib::Option
   return true;
 }
 
-bool ExampleOptionGroup::on_post_parse(Glib::OptionContext& context, Glib::OptionGroup& group)
+bool ExampleOptionGroup::on_post_parse(Glib::OptionContext& /* context */, Glib::OptionGroup& /* group */)
 {
   //This is called after the m_arg_* instances are given their values.
   // You do not need to override this method. This is just here to show you how,
@@ -98,7 +98,7 @@ bool ExampleOptionGroup::on_post_parse(Glib::OptionContext& context, Glib::Optio
   return true;
 }
 
-void ExampleOptionGroup::on_error(Glib::OptionContext& context, Glib::OptionGroup& group)
+void ExampleOptionGroup::on_error(Glib::OptionContext& /* context */, Glib::OptionGroup& /* group */)
 {
   std::cout << "on_error called" << std::endl;
 }