Corrected a couple of typos in the macosx backend support for double clicking. This

backend works now.

Author: dhyams

src/_macosx.m

@@ -5128,7 +5128,7 @@ - (void)mouseDown:(NSEvent *)event
          case NSRightMouseDown: num = 3; break;
          default: return; /* Unknown mouse event */
     }
-    if ([event clickCount] == 2]) {
+    if ([event clickCount] == 2) {
       dblclick = 1;
     } 
     gstate = PyGILState_Ensure();
@@ -5217,7 +5217,7 @@ - (void)rightMouseDown:(NSEvent *)event
     x = location.x;
     y = location.y;
     gstate = PyGILState_Ensure();
-    if ([event clickCount] == 2]) {
+    if ([event clickCount] == 2) {
       dblclick = 1;
     } 
     result = PyObject_CallMethod(canvas, "button_press_event", "iiii", x, y, num, dblclick);
@@ -5278,7 +5278,7 @@ - (void)otherMouseDown:(NSEvent *)event
     x = location.x;
     y = location.y;
     gstate = PyGILState_Ensure();
-    if ([event clickCount] == 2]) {
+    if ([event clickCount] == 2) {
       dblclick = 1;
     } 
     result = PyObject_CallMethod(canvas, "button_press_event", "iiii", x, y, num, dblclick);