[geary] Remove now-unused mail-spam-symbolic icon. Bug 737862.

[Michael Gratton <mjog src gnome org>]

commit c9a29ebb3ceced0d9a3e2d4f473b3063b54b2ecc
Author: Michael James Gratton <mike vee net>
Date:   Thu Jul 14 13:06:52 2016 +1000

    Remove now-unused mail-spam-symbolic icon. Bug 737862.

 COPYING.icons                    |    4 --
 icons/CMakeLists.txt             |    2 -
 icons/mail-spam-rtl-symbolic.svg |   57 --------------------------------------
 icons/mail-spam-symbolic.svg     |   52 ----------------------------------
 4 files changed, 0 insertions(+), 115 deletions(-)
---
diff --git a/COPYING.icons b/COPYING.icons
index e8172ca..0f497ac 100644
--- a/COPYING.icons
+++ b/COPYING.icons
@@ -26,10 +26,6 @@ text-x-generic-symbolic.svg
     Document designed by Edward Boatman from The Noun Project
     http://thenounproject.com/noun/document/#icon-No453
 
-mail-spam-symbolic.svg
-    Pig designed by aLf from The Noun Project
-    http://thenounproject.com/noun/pig/#icon-No5271
-
 close-symbolic.svg
     Close designed by Icomatic from The Noun Project
     http://thenounproject.com/noun/close/#icon-No18932
diff --git a/icons/CMakeLists.txt b/icons/CMakeLists.txt
index c21504a..b69549c 100644
--- a/icons/CMakeLists.txt
+++ b/icons/CMakeLists.txt
@@ -19,8 +19,6 @@ set(ICON_FILES
     mail-reply-sender-rtl-symbolic.svg
     mail-sent-symbolic.svg
     mail-sent-rtl-symbolic.svg
-    mail-spam-symbolic.svg
-    mail-spam-rtl-symbolic.svg
     marker-symbolic.svg
     tag-symbolic.svg
     tag-rtl-symbolic.svg