fixes for the compilation warnings with Sun CC:

1. some fixes for "String literal to char * conversion" warnings (many
   more left in the *.xpm files)
2. fixes for "assignment of function to extern "C" function"
3. a few other miscellaneous ones


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@13478 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/gtk/minifram.cpp

@@ -270,7 +270,7 @@ static void gtk_button_clicked_callback( GtkWidget *WXUNUSED(widget), wxMiniFram
 // wxMiniFrame
 //-----------------------------------------------------------------------------
 
-static char *cross_xpm[] = {
+static const char *cross_xpm[] = {
 /* columns rows colors chars-per-pixel */
 "5 5 16 1",
 "  c Gray0",
@@ -321,7 +321,13 @@ bool wxMiniFrame::Create( wxWindow *parent, wxWindowID id, const wxString &title
         ((style & wxCAPTION) || (style & wxTINY_CAPTION_HORIZ) || (style & wxTINY_CAPTION_VERT)))
     {
         GdkBitmap *mask = (GdkBitmap*) NULL;
-        GdkPixmap *pixmap = gdk_pixmap_create_from_xpm_d( wxGetRootWindow()->window, &mask, NULL, cross_xpm );
+        GdkPixmap *pixmap = gdk_pixmap_create_from_xpm_d
+                            (
+                                wxGetRootWindow()->window,
+                                &mask,
+                                NULL,
+                                (char **)cross_xpm
+                            );
 
         GtkWidget *pw = gtk_pixmap_new( pixmap, mask );
         gdk_bitmap_unref( mask );