[pangomm] C++11: Mark all _CLASS_OPAQUE_REFCOUNTED classes as final.

[Murray Cumming <murrayc src gnome org>]

commit 704676e7f3b9835bb2b1866eb31625138b8759c7
Author: Murray Cumming <murrayc murrayc com>
Date:   Sat Aug 22 11:48:16 2015 +0200

    C++11: Mark all _CLASS_OPAQUE_REFCOUNTED classes as final.
    
    Because _CLASS_OPAQUE_REFCOUNTED already generates a comment
    telling us not to derive from them, presumably because they can
    only be instantiated by reinterpret_cast<>ing a base C struct.
    
    Ideally, _CLASS_OPAQUE_REFCOUNTED would add the final keyword,
    but the class line is is not generated, so that would be a little
    difficult.

 pango/src/coverage.hg   |    2 +-
 pango/src/layoutline.hg |    2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/pango/src/coverage.hg b/pango/src/coverage.hg
index d74b6a0..747e8e6 100644
--- a/pango/src/coverage.hg
+++ b/pango/src/coverage.hg
@@ -35,7 +35,7 @@ _WRAP_ENUM(CoverageLevel, PangoCoverageLevel)
  * It is often necessary in pango to determine if a particular font can represent a particular character,
  * and also how well it can represent that character. Pango::Coverage holds this information.
  */
-class Coverage
+class Coverage final
 {
   _CLASS_OPAQUE_REFCOUNTED(Coverage, PangoCoverage, pango_coverage_new, pango_coverage_ref, 
pango_coverage_unref)
   _IGNORE(pango_coverage_ref, pango_coverage_unref)
diff --git a/pango/src/layoutline.hg b/pango/src/layoutline.hg
index 38fce1a..c079b84 100644
--- a/pango/src/layoutline.hg
+++ b/pango/src/layoutline.hg
@@ -37,7 +37,7 @@ class Layout;
  * and are only valid until the text, attributes, or settings of the parent Pango::Layout are modified.
  * Routines for rendering Pango::Layout objects are provided in code specific to each rendering system.
  */
-class LayoutLine
+class LayoutLine final
 {
   _CLASS_OPAQUE_REFCOUNTED(LayoutLine, PangoLayoutLine, NONE, pango_layout_line_ref, pango_layout_line_unref)
   _IGNORE(pango_layout_line_ref, pango_layout_line_unref)