Fix wxGTK1 build after wxFont API changes

Implement the new {Get,Set}{FractionalPointSize,NumericWeight} methods.

Also change wxLoadQueryFont() to use wxNativeFontInfo methods as a side
effect, to reduce code duplication and reuse the existing support for
numeric weights and fractional point sizes in wxNativeFontInfo.

include/wx/gtk1/font.h

@@ -90,19 +90,19 @@ public:
     virtual ~wxFont();
 
     // implement base class pure virtuals
-    virtual int GetPointSize() const;
+    virtual float GetFractionalPointSize() const;
     virtual wxFontStyle GetStyle() const;
-    virtual wxFontWeight GetWeight() const;
+    virtual int GetNumericWeight() const;
     virtual wxString GetFaceName() const;
     virtual bool GetUnderlined() const;
     virtual wxFontEncoding GetEncoding() const;
     virtual const wxNativeFontInfo *GetNativeFontInfo() const;
     virtual bool IsFixedWidth() const;
 
-    virtual void SetPointSize( int pointSize );
+    virtual void SetFractionalPointSize(float pointSize);
     virtual void SetFamily(wxFontFamily family);
     virtual void SetStyle(wxFontStyle style);
-    virtual void SetWeight(wxFontWeight weight);
+    virtual void SetNumericWeight(int weight);
     virtual bool SetFaceName( const wxString& faceName );
     virtual void SetUnderlined( bool underlined );
     virtual void SetEncoding(wxFontEncoding encoding);

include/wx/unix/fontutil.h

@@ -21,10 +21,10 @@
 
 // returns the handle of the nearest available font or 0
 extern wxNativeFont
-wxLoadQueryNearestFont(int pointSize,
+wxLoadQueryNearestFont(float pointSize,
                        wxFontFamily family,
                        wxFontStyle style,
-                       wxFontWeight weight,
+                       int weight,
                        bool underlined,
                        const wxString &facename,
                        wxFontEncoding encoding,