[dia] We've never used GtkVWrapBox so theres little value in keeping it around

[Zander <zbrown src gnome org>]

commit d7fd3c783920fdd3ab2f0aca1796b3c9a507978d
Author: Zander Brown <zbrown gnome org>
Date:   Mon May 13 21:50:26 2019 +0100

    We've never used GtkVWrapBox so theres little value in keeping it around

 app/gtkvwrapbox.c | 608 ------------------------------------------------------
 app/gtkvwrapbox.h |  70 -------
 app/meson.build   |   1 -
 3 files changed, 679 deletions(-)
---
diff --git a/app/meson.build b/app/meson.build
index c8d5ca4f..aa147550 100644
--- a/app/meson.build
+++ b/app/meson.build
@@ -37,7 +37,6 @@ dia_sources = [
     'dia-props.c',
     'gtkwrapbox.c',
     'gtkhwrapbox.c',
-    'gtkvwrapbox.c',
     'cursor.c',
     'splash.c',
     'recent_files.c',