Fix wxGTK wxHyperlinkCtrl compilation problem with g++ 5.2

Make wxHyperlinkCtrl ctors non-inline to work around an error about incomplete
wxHyperlinkCtrlColData in the inline ctor body with this compiler (but not
with g++ 4.9 nor 5.3, somehow).

Closes #17089.

include/wx/gtk/hyperlink.h

@@ -27,22 +27,18 @@ class WXDLLIMPEXP_ADV wxHyperlinkCtrl : public wxGenericHyperlinkCtrl
 {
     typedef wxGenericHyperlinkCtrl base_type;
 public:
-    // Default constructor (for two-step construction).
-    wxHyperlinkCtrl() { }
-
-    // Constructor.
+    // Constructors (notice that they can't be defined inline for this class
+    // because of m_colData which uses incomplete wxHyperlinkCtrlColData).
+    wxHyperlinkCtrl();
     wxHyperlinkCtrl(wxWindow *parent,
                     wxWindowID id,
                     const wxString& label, const wxString& url,
                     const wxPoint& pos = wxDefaultPosition,
                     const wxSize& size = wxDefaultSize,
                     long style = wxHL_DEFAULT_STYLE,
-                    const wxString& name = wxHyperlinkCtrlNameStr)
-    {
-        (void)Create(parent, id, label, url, pos, size, style, name);
-    }
+                    const wxString& name = wxHyperlinkCtrlNameStr);
 
-    ~wxHyperlinkCtrl();
+    virtual ~wxHyperlinkCtrl();
 
     // Creation function (for two-step construction).
     bool Create(wxWindow *parent,

src/gtk/hyperlink.cpp

@@ -110,6 +110,22 @@ public:
 // wxHyperlinkCtrl
 // ----------------------------------------------------------------------------
 
+wxHyperlinkCtrl::wxHyperlinkCtrl()
+{
+}
+
+wxHyperlinkCtrl::wxHyperlinkCtrl(wxWindow *parent,
+                                 wxWindowID id,
+                                 const wxString& label,
+                                 const wxString& url,
+                                 const wxPoint& pos,
+                                 const wxSize& size,
+                                 long style,
+                                 const wxString& name)
+{
+    (void)Create(parent, id, label, url, pos, size, style, name);
+}
+
 wxHyperlinkCtrl::~wxHyperlinkCtrl()
 {
 #ifndef __WXGTK3__