Initial port to Linux (using Allegro).

64-bit fixes.
Some changes to aid portability.
A few other tweaks.

src/plat-joystick.h

@@ -3,7 +3,7 @@ extern "C" {
 #endif
         void joystick_init();
         void joystick_close();
-        void poll_joystick();
+        void joystick_poll();
         
         typedef struct joystick_t
         {
@@ -15,5 +15,4 @@ extern "C" {
         extern int joysticks_present;
 #ifdef __cplusplus
 }
-#endif
-
+#endif