Linux joystick: Look at entire axis namespace for controls (thanks, "spaz16"!).

This apparently has fallout: the PS4 (and maybe PS3?) controllers apparently
report some bogus axes, but it won't change the axes we currently expect, and
thus the game controller config string is still stable.

Fixes Bugzilla #2719.

src/joystick/linux/SDL_sysjoystick.c

@@ -492,7 +492,7 @@ ConfigJoystick(SDL_Joystick * joystick, int fd)
                 ++joystick->nbuttons;
             }
         }
-        for (i = 0; i < ABS_MISC; ++i) {
+        for (i = 0; i < ABS_MAX; ++i) {
             /* Skip hats */
             if (i == ABS_HAT0X) {
                 i = ABS_HAT3Y;
@@ -753,10 +753,6 @@ HandleInputEvents(SDL_Joystick * joystick)
                 }
                 break;
             case EV_ABS:
-                if (code >= ABS_MISC) {
-                    break;
-                }
-
                 switch (code) {
                 case ABS_HAT0X:
                 case ABS_HAT0Y: