[pango] win32: Add a placeholder for new underline values

[Matthias Clasen <matthiasc src gnome org>]

commit 2099fcf52b4f33da77c9fe11210ee3c2c927c449
Author: Matthias Clasen <mclasen redhat com>
Date:   Fri Nov 1 13:54:42 2019 -0400

    win32: Add a placeholder for new underline values
    
    Somebody with access to a win32 machine will have
    to implement these, as well as overline.
    
    This placeholder should at least fix the build
    with draconian compiler flags (-Werror=switch).

 pango/pangowin32.c | 5 +++++
 1 file changed, 5 insertions(+)
---
diff --git a/pango/pangowin32.c b/pango/pangowin32.c
index c08ae24b..737cfa14 100644
--- a/pango/pangowin32.c
+++ b/pango/pangowin32.c
@@ -1044,6 +1044,11 @@ pango_win32_render_layout_line (HDC              hdc,
          points[1].x = x + PANGO_PIXELS (x_off + ink_rect.x + ink_rect.width);
          Polyline (hdc, points, 2);
          break;
+       case PANGO_UNDERLINE_SINGLE_LINE:
+       case PANGO_UNDERLINE_DOUBLE_LINE:
+       case PANGO_UNDERLINE_ERROR_LINE:
+          g_warning ("Underline value %d not implemented", uline);
+          break;
        }
 
       if (uline != PANGO_UNDERLINE_NONE)