Merge branch 'wxradiobox' of https://github.com/MaartenBent/wxWidgets

Several wxRadioBox-related improvements:

- Fix its minimum width calculation to take the title into account.
- Remove unused nor useful wxRA_LEFTTORIGHT and wxRA_TOPTOBOTTOM.
- Tidy up the radiobox page of the widgets sample.

See https://github.com/wxWidgets/wxWidgets/pull/1187

interface/wx/defs.h

@@ -379,9 +379,8 @@ enum wxBorder
 
 /*
  * wxRadioBox style flags
+ * These styles are not used in any port.
  */
-/*  should we number the items from left to right or from top to bottom in a 2d */
-/*  radiobox? */
 #define wxRA_LEFTTORIGHT    0x0001
 #define wxRA_TOPTOBOTTOM    0x0002