[gnome-control-center] thunderbolt: Remove unused BINDIR define

[Benjamin Berg <bberg src gnome org>]

commit 5087de2f85d769df185d2eae6a18d74702abf016
Author: Robert Ancell <robert ancell canonical com>
Date:   Fri Apr 17 11:27:08 2020 +1200

    thunderbolt: Remove unused BINDIR define

 panels/thunderbolt/meson.build | 4 ----
 1 file changed, 4 deletions(-)
---
diff --git a/panels/thunderbolt/meson.build b/panels/thunderbolt/meson.build
index 2b1a03a42..53aa9b466 100644
--- a/panels/thunderbolt/meson.build
+++ b/panels/thunderbolt/meson.build
@@ -61,10 +61,6 @@ deps = common_deps + [
   m_dep,
 ]
 
-cflags += [
-  '-DBINDIR="@0@"'.format(control_center_bindir)
-]
-
 panels_libs += static_library(
   cappletname,
   sources: sources,