[gtk+] spinbutton: Remove an unused define

[Timm Bäder <baedert src gnome org>]

commit 0acb4041663a5c1635428e06a6c0fc756de762c3
Author: Timm Bäder <mail baedert org>
Date:   Mon Apr 24 16:22:26 2017 +0200

    spinbutton: Remove an unused define

 gtk/gtkspinbutton.c |    1 -
 1 files changed, 0 insertions(+), 1 deletions(-)
---
diff --git a/gtk/gtkspinbutton.c b/gtk/gtkspinbutton.c
index b0b15c7..9861b14 100644
--- a/gtk/gtkspinbutton.c
+++ b/gtk/gtkspinbutton.c
@@ -61,7 +61,6 @@
 #define MAX_TIMER_CALLS       5
 #define EPSILON               1e-10
 #define MAX_DIGITS            20
-#define MIN_ARROW_WIDTH       6
 #define TIMEOUT_INITIAL       500
 #define TIMEOUT_REPEAT        50