readline: Remove unused patch

config-dirent-symbols.patch was removed from SRC_URI as "already
applied in upstream" in 983a4986947.

(From OE-Core rev: 43e764a54458c9c6665bb7734b1fc7e7956bffdc)

Signed-off-by: Jussi Kukkonen <jussi.kukkonen@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-core/readline/files/config-dirent-symbols.patch

@@ -1,34 +0,0 @@
-Fix the names of the STRUCT_DIRENT_D symbols to match the names used by both
-configure and the source code.
-
-Upstream-Status: Submitted (http://lists.gnu.org/archive/html/bug-readline/2014-05/msg00008.html)
-Signed-off-by: Ross Burton <ross.burton@intel.com>
-
-From e48656811550774892fd4e0f4b3c7d418422da52 Mon Sep 17 00:00:00 2001
-From: Ross Burton <ross.burton@intel.com>
-Date: Tue, 27 May 2014 22:32:31 +0100
-Subject: [PATCH] config.h.in: fix names of STRUCT_DIRENT_D symbols
-
----
- config.h.in |    4 ++--
- 1 file changed, 2 insertions(+), 2 deletions(-)
-
-diff --git a/config.h.in b/config.h.in
-index a67e43e..a42acc5 100644
---- a/config.h.in
-+++ b/config.h.in
-@@ -244,9 +244,9 @@
- 
- #undef HAVE_GETPW_DECLS
- 
--#undef STRUCT_DIRENT_HAS_D_INO
-+#undef HAVE_STRUCT_DIRENT_D_INO
- 
--#undef STRUCT_DIRENT_HAS_D_FILENO
-+#undef HAVE_STRUCT_DIRENT_D_FILENO
- 
- #undef HAVE_BSD_SIGNALS
- 
--- 
-1.7.10.4
-