[gnome-builder] build: remove dead gutter code

[Christian Hergert <chergert src gnome org>]

commit f777721db1ef80c2f4af359aa1a9034963b674f5
Author: Christian Hergert <chergert redhat com>
Date:   Sun Nov 5 18:41:44 2017 -0800

    build: remove dead gutter code

 src/libide/debugger/ide-debugger-gutter-renderer.c |  395 --------------------
 src/libide/debugger/ide-debugger-gutter-renderer.h |   38 --
 src/libide/debugger/meson.build                    |    2 -
 3 files changed, 0 insertions(+), 435 deletions(-)
---
diff --git a/src/libide/debugger/meson.build b/src/libide/debugger/meson.build
index ca74743..5e828d3 100644
--- a/src/libide/debugger/meson.build
+++ b/src/libide/debugger/meson.build
@@ -41,8 +41,6 @@ debugger_private_sources = [
   'ide-debugger-editor-addin.c',
   'ide-debugger-editor-addin.h',
   'ide-debugger-fallbacks.c',
-  'ide-debugger-gutter-renderer.c',
-  'ide-debugger-gutter-renderer.h',
   'ide-debugger-libraries-view.c',
   'ide-debugger-libraries-view.h',
   'ide-debugger-locals-view.c',