games-fps/alienarena: remove unused patch

Closes: https://github.com/gentoo/gentoo/pull/2919

games-fps/alienarena/files/alienarena-20130207-nodocs.patch

@@ -1,16 +0,0 @@
-diff -ru alienarena-7.51.orig/Makefile.am alienarena-7.51/Makefile.am
---- alienarena-7.51.orig/Makefile.am	2011-03-05 19:34:07.000000000 -0500
-+++ alienarena-7.51/Makefile.am	2011-03-13 01:39:37.179366503 -0500
-@@ -23,12 +23,6 @@
- ACLOCAL_AMFLAGS = -I m4 
- 
- # Alien Arena documents to be installed in $docdir
--if INSTALL_DOCS
--dist_doc_DATA = \
--	docs/license.txt \
--	docs/README.txt \
--	README
--endif
- 
- # FUSE game server browser and Server management scripts
- # COPYING and INSTALL are GNU/FSF-supplied documents.