wxMGL build fixes for current HEAD (and 2.7.2)

[ABX]

Hi!

There is long list of posts unreaded here so I'm not sure about current commit
policy so please take this quick build fix for wxMGL sources:

diff -u -3 -P -r wxWidgets/src/mgl/bitmap.cpp wxW/src/mgl/bitmap.cpp
--- wxWidgets/src/mgl/bitmap.cpp	Fri Nov 03 10:34:53 2006
+++ wxW/src/mgl/bitmap.cpp	Fri Nov 03 17:36:46 2006
@@ -647,7 +647,8 @@
     int w = bitmap->GetWidth(),
         h = bitmap->GetHeight();
 
-    mem.SelectObject(*bitmap);
+    wxBitmap bmp(*bitmap);
+    mem.SelectObject(bmp);
     tdc = mem.GetMGLDC();
 
     switch (type)
diff -u -3 -P -r wxWidgets/src/mgl/brush.cpp wxW/src/mgl/brush.cpp
--- wxWidgets/src/mgl/brush.cpp	Fri Nov 03 10:34:53 2006
+++ wxW/src/mgl/brush.cpp	Fri Nov 03 17:42:37 2006
@@ -35,7 +35,8 @@
 
     if ( pix != NULL )
     {
-        mem.SelectObject(bitmap);
+        wxBitmap bmpPix(bitmap);
+        mem.SelectObject(bmpPix);
         dc = mem.GetMGLDC();
         wxCurrentDCSwitcher curDC(dc);
         dc->beginPixel();
@@ -50,7 +51,8 @@
 
     if ( mask && bitmap.GetMask() )
     {
-        mem.SelectObject(bitmap.GetMask()->GetBitmap());
+        wxBitmap bmpMask(bitmap.GetMask()->GetBitmap());
+        mem.SelectObject(bmpMask);
         dc = mem.GetMGLDC();
         wxCurrentDCSwitcher curDC(dc);
         dc->beginPixel();
diff -u -3 -P -r wxWidgets/src/mgl/dc.cpp wxW/src/mgl/dc.cpp
--- wxWidgets/src/mgl/dc.cpp	Fri Sep 29 10:55:33 2006
+++ wxW/src/mgl/dc.cpp	Fri Nov 03 17:48:07 2006
@@ -1091,7 +1091,7 @@
 {
     wxCHECK_RET( Ok(), wxT("invalid dc") );
 
-    if ( palette == wxNullPalette )
+    if ( palette.IsNull() )
     {
         if ( m_oldPalette.Ok() )
             SetPalette(m_oldPalette);
@@ -1099,7 +1099,10 @@
     }
 
     if ( !palette.Ok() ) return;
+#if 0
+    // TODO: reenable when '==' is back
     if ( m_palette == palette ) return;
+#endif
     m_oldPalette = m_palette;
     m_palette = palette;
 
diff -u -3 -P -r wxWidgets/src/mgl/pen.cpp wxW/src/mgl/pen.cpp
--- wxWidgets/src/mgl/pen.cpp	Fri Nov 03 10:34:53 2006
+++ wxW/src/mgl/pen.cpp	Fri Nov 03 17:55:19 2006
@@ -38,7 +38,11 @@
         // we intentionally don't compare m_hPen fields here
         return m_style == data.m_style &&
                m_width == data.m_width &&
+#if 0
+               // pixpattern24_t is struct { uchar p[8][8][3]; }
+               // so operator '==' is not clear
                m_pixPattern == data.m_pixPattern &&
+#endif
                m_capStyle == data.m_capStyle &&
                m_joinStyle == data.m_joinStyle &&
                m_colour == data.m_colour &&