gnu: Remove tgif.

* gnu/packages/image.scm (tgif): Delete variable.

Fixes: guix/guix#3683
Change-Id: Iac4c899fa227ab5fb590dd28a8bbfb2b61e1686d

gnu/packages/image.scm

@@ -741,32 +741,6 @@ maximum quality factor.")
    (license license:gpl3+)
    (home-page "https://www.kokkonen.net/tjko/projects.html#jpegoptim")))
 
-(define-public tgif
-  (package
-    (name "tgif")
-    (version "4.2.5")
-    (source
-      (origin
-        (method url-fetch)
-        (uri (string-append
-               "mirror://sourceforge/tgif/tgif/"
-               version "/tgif-QPL-" version ".tar.gz"))
-        (sha256
-          (base32 "1fk7qnqjmrr390bclwqrvlmh77bcl28hdn4vfdqydrpsrbzfj91g"))))
-    (build-system gnu-build-system)
-    (inputs
-      (list libx11
-            libxext
-            libxt
-            libxmu
-            zlib))
-    (home-page "http://bourbon.usc.edu/tgif/")
-    (synopsis "Xlib based interactive 2-D drawing tool")
-    (description
-      "Tgif (pronounced t-g-i-f) is an Xlib based interactive 2-D drawing tool
-(using vector graphics) under X11.")
-    (license license:qpl)))
-
 (define-public libicns
   (package
     (name "libicns")