Fixed minor compilation warnings on linux.

git-svn-id: svn+ssh://svn.code.sf.net/p/supertuxkart/code/trunk/supertuxkart@2821 178a84e3-b1eb-0310-8ba1-8eac791a3b58

src/items/cake.cpp

@@ -159,4 +159,4 @@ void Cake::update(float dt)
     }
     
     Flyable::update(dt);
-}   // update
+}   // update

src/karts/kart.cpp

@@ -573,7 +573,7 @@ void Kart::update(float dt)
     {
         // let kart fall a bit before rescuing
         if( RaceManager::getTrack()->m_left_driveline.size() > 0 &&
-            abs( getXYZ().getZ() - RaceManager::getTrack()->m_left_driveline[0].getZ() ) > 17)
+            fabs( getXYZ().getZ() - RaceManager::getTrack()->m_left_driveline[0].getZ() ) > 17)
             forceRescue();    
     } 
     else if(material)

src/karts/kart_model.cpp

@@ -275,4 +275,4 @@ void KartModel::resetWheels()
         const float suspension[4]={0,0,0,0};
         adjustWheels(0, 0, suspension);
     }
-}   // reset
+}   // reset

src/karts/player_kart.cpp

@@ -363,4 +363,4 @@ void PlayerKart::doingShortcut()
     // Can happen if the option menu is called
     if(m)
         m->addMessage(_("Invalid short-cut!!"), this, 2.0f, 60);
-}   // doingShortcut
+}   // doingShortcut