tools/starpu_perfmodel_display.c: revert 6934 as problem is now fixed by 6936

tools/starpu_perfmodel_display.c

@@ -29,7 +29,6 @@
 #include <windows.h>
 #endif
 
-static struct starpu_perfmodel model;
 #define PROGNAME "starpu_perfmodel_display"
 
 /* display all available models */
@@ -384,6 +383,7 @@ int main(int argc, char **argv)
         }
         else
 	{
+		struct starpu_perfmodel model;
                 int ret = starpu_load_history_debug(symbol, &model);
                 if (ret == 1)
 		{