Fixed bug 2631 - Mac: minor code cleanup

Alex Szpakowski

Some minor changes to the Mac-specific backend code:

- Fixed up some code style issues (mostly brace style inconsistencies).

- Fixed a compiler warning in SDL_cocoaevents.m.

- Removed some useless code now that the 10.7 SDK is required to build SDL.

- Removed Gestalt(gestaltSystemVersion, ...) call and switched to NSAppKitVersionNumber for version checking code. Using Gestalt with gestaltSystemVersion will give 0x1090 in Mac OS 10.10+, and the whole Gestalt function was deprecated in Mac OS 10.8.

src/joystick/darwin/SDL_sysjoystick.c

@@ -406,17 +406,13 @@ JoystickDeviceWasAddedCallback(void *ctx, IOReturn res, void *sender, IOHIDDevic
     s_bDeviceAdded = SDL_TRUE;
 
     /* Add device to the end of the list */
-    if ( !gpDeviceList )
-    {
+    if ( !gpDeviceList ) {
         gpDeviceList = device;
-    }
-    else
-    {
+    } else {
         recDevice *curdevice;
 
         curdevice = gpDeviceList;
-        while ( curdevice->pNext )
-        {
+        while ( curdevice->pNext ) {
             curdevice = curdevice->pNext;
         }
         curdevice->pNext = device;