gnu: Remove python-pydiff.

This package is a leaf package, stale for 11 years and not compatible
with the latest python.

* gnu/packages/python-xyz.scm (python-pydiff): Delete variable.

Change-Id: Ia80e3949c4d05b584241d783d49207c8553e9da1
Signed-off-by: Steve George <steve@futurile.net>

gnu/packages/python-xyz.scm

@@ -27979,25 +27979,6 @@ pure Python module.")
 version of @code{SocksiPy} with bug fixes and extra features.")
     (license license:bsd-3)))
 
-(define-public python-pydiff
-  (package
-    (name "python-pydiff")
-    (version "0.2")
-    (source
-      (origin
-        (method url-fetch)
-        (uri (pypi-uri "pydiff" version))
-        (sha256
-          (base32
-            "1als83h9w0gab24ipyna6khm390qmpnpkc5jksmdbs2xc8hp2z44"))))
-    (build-system python-build-system)
-    (home-page "https://github.com/myint/pydiff")
-    (synopsis "Library to diff two Python files at the bytecode level")
-    (description
-      "@code{pydiff} makes it easy to look for actual code changes while
-ignoring formatting changes.")
-    (license license:expat)))
-
 (define-public python-pydub
   (package
     (name "python-pydub")