Removed some VS C++ compiler warnings.

git-svn-id: svn+ssh://svn.code.sf.net/p/supertuxkart/code/trunk/supertuxkart@1422 178a84e3-b1eb-0310-8ba1-8eac791a3b58

src/lisp/lexer.cpp

@@ -44,7 +44,8 @@ namespace lisp
             nextChar();
         }
         catch(EOFException& e)
-        {}
+        {(void)e;  // avoid 'unreferenced local variable' warning
+        }
     }
 
 //-----------------------------------------------------------------------------

src/user_config.cpp

@@ -370,6 +370,7 @@ void UserConfig::loadConfig(const std::string& filename)
     }
     catch(std::exception& e)
     {
+        (void)e;  // avoid warning about unreferenced local variable
         printf(_("Config file '%s' does not exist, it will be created.\n"), 
                filename.c_str());
         delete root;

src/widget.cpp

@@ -305,8 +305,6 @@ void Widget::update(const float DELTA)
         size_t line_start = 0;
         bool draw;
         bool out_of_rect = false;
-        float top, bottom;
-        int text_height;
 
         glEnable( GL_SCISSOR_TEST );
         do