[gimp] app: fix unused variable warning in warp tool

[N/A <ell src gnome org>]

commit ff91bb1b5ba77e7c7a46e82efcb4943d78a79658
Author: Ell <ell_se yahoo com>
Date:   Tue May 30 19:54:11 2017 -0400

    app: fix unused variable warning in warp tool
    
    ... due to commit 7136f09f0a080f438d7819f83a806515676539f9

 app/tools/gimpwarptool.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/app/tools/gimpwarptool.c b/app/tools/gimpwarptool.c
index 476b230..aa40b23 100644
--- a/app/tools/gimpwarptool.c
+++ b/app/tools/gimpwarptool.c
@@ -458,6 +458,8 @@ gimp_warp_tool_cursor_update (GimpTool         *tool,
           modifier = GIMP_CURSOR_MODIFIER_MOVE;
           break;
         }
+#else
+      (void) options;
 #endif
     }