Removed warning for g++ compilations.

git-svn-id: svn+ssh://svn.code.sf.net/p/supertuxkart/code/trunk/supertuxkart@1506 178a84e3-b1eb-0310-8ba1-8eac791a3b58

src/physics.cpp

@@ -213,7 +213,10 @@ btScalar Physics::solveGroup(btCollisionObject** bodies, int numBodies,
                 //        the track when accelerating, causing a constant crash sfx
                 //        to be played. Might be fixed with better physics parameters
                 //upB->getPointerKart()->crashed();
-                0;  // avoid VS compiler warning while the above statement is commented out
+#if defined(WIN32) && !defined(__CYGWIN__)
+                0  // avoid VS compiler warning while the above statement is commented out
+#endif
+	        ;
         }
         // 2) object a is a kart
         // =====================