Include wx/button.h according to precompiled headers of wx/wx.h (with other minor cleaning).

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@39185 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/os2/button.cpp

@@ -1,5 +1,5 @@
 /////////////////////////////////////////////////////////////////////////////
-// Name:        button.cpp
+// Name:        src/os2/button.cpp
 // Purpose:     wxButton
 // Author:      David Webster
 // Modified by:
@@ -12,9 +12,10 @@
 // For compilers that support precompilation, includes "wx.h".
 #include "wx/wxprec.h"
 
+#include "wx/button.h"
+
 #ifndef WX_PRECOMP
     #include "wx/app.h"
-    #include "wx/button.h"
     #include "wx/brush.h"
     #include "wx/panel.h"
     #include "wx/bmpbuttn.h"
@@ -89,7 +90,7 @@ bool wxButton::Create( wxWindow*          pParent,
                                       );
     if (m_hWnd == 0)
     {
-        return FALSE;
+        return false;
     }
 
     //