Cleanup: use arrayWithObject to reduce the code

Similar code is found in Apple's code samples.

Differential Revision: https://developer.blender.org/D11434

intern/ghost/intern/GHOST_WindowViewCocoa.h

@@ -74,12 +74,7 @@
     composing = YES;
 
     // interpret event to call insertText
-    NSMutableArray *events;
-    events = [[NSMutableArray alloc] initWithCapacity:1];
-    [events addObject:event];
-    [self interpretKeyEvents:events];  // calls insertText
-    [events removeObject:event];
-    [events release];
+    [self interpretKeyEvents:[NSArray arrayWithObject:event]];  // calls insertText
     return;
   }
 }