gdb: add patch adding support for readline 8.2

Add "001-Add-support-for-readline-8.2.patch" adding support for readline
8.2.

Signed-off-by: Nick Hainke <vincent@systemli.org>

package/devel/gdb/patches/001-Add-support-for-readline-8.2.patch

@@ -0,0 +1,31 @@
+From 1add37b567a7dee39d99f37b37802034c3fce9c4 Mon Sep 17 00:00:00 2001
+From: Andreas Schwab <schwab@linux-m68k.org>
+Date: Sun, 20 Mar 2022 14:01:54 +0100
+Subject: [PATCH] Add support for readline 8.2
+
+In readline 8.2 the type of rl_completer_word_break_characters changed to
+include const.
+---
+ gdb/completer.c | 4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+--- a/gdb/completer.c
++++ b/gdb/completer.c
+@@ -36,7 +36,7 @@
+    calling a hook instead so we eliminate the CLI dependency.  */
+ #include "gdbcmd.h"
+ 
+-/* Needed for rl_completer_word_break_characters() and for
++/* Needed for rl_completer_word_break_characters and for
+    rl_filename_completion_function.  */
+ #include "readline/readline.h"
+ 
+@@ -2011,7 +2011,7 @@ gdb_completion_word_break_characters_thr
+       rl_basic_quote_characters = NULL;
+     }
+ 
+-  return rl_completer_word_break_characters;
++  return (char *) rl_completer_word_break_characters;
+ }
+ 
+ char *