Name the anonymous enum for WMButton behaviors.

This is needed so that bindgen cann refer to the enum properly when generating a corresponding Rust type.

WINGs/WINGs/WINGs.h

@@ -132,7 +132,7 @@ typedef enum {
 } WMButtonType;
 
 /* button behaviour masks */
-enum {
+typedef enum {
     WBBSpringLoadedMask = (1 << 0),
     WBBPushInMask       = (1 << 1),
     WBBPushChangeMask   = (1 << 2),
@@ -140,7 +140,7 @@ enum {
     WBBStateLightMask   = (1 << 5),
     WBBStateChangeMask  = (1 << 6),
     WBBStatePushMask    = (1 << 7)
-};
+} WMButtonBehaviorMask;
 
 
 /* frame title positions */