[python-igraph] Remove patch that are no longer used

[Pierre-YvesChibon]

commit 4d3dde719ae73f6d4312fcae1a19d542096bb352
Author: Pierre-Yves Chibon <pingou at pingoured.fr>
Date:   Thu Dec 12 17:43:35 2013 +0100

    Remove patch that are no longer used

 python-igraph-authors.diff |    5 --
 python-igraph-memory.diff  |   52 ----------------
 python-igraph-parse.diff   |  145 --------------------------------------------
 python-igraph.diffs        |   51 ---------------
 4 files changed, 0 insertions(+), 253 deletions(-)