gdb: Patch for building with readline-8.2

- Patch required for successful building with readline-8.2
   In readline 8.2 the type of rl_completer_word_break_characters changed to
   include const.

Signed-off-by: Adolf Belka <adolf.belka@ipfire.org>
Reviewed-by: Michael Tremer <michael.tremer@ipfire.org>

lfs/gdb

@@ -70,6 +70,7 @@ $(subst %,%_BLAKE2,$(objects)) :
 $(TARGET) : $(patsubst %,$(DIR_DL)/%,$(objects))
 	@$(PREBUILD)
 	@rm -rf $(DIR_APP) && cd $(DIR_SRC) && tar axf $(DIR_DL)/$(DL_FILE)
+	cd $(DIR_APP) && patch -Np1 < $(DIR_SRC)/src/patches/gdb-readline8.2.patch
 	cd $(DIR_APP) && mkdir -pv build
 	cd $(DIR_APP)/build && \
 		../configure \

src/patches/gdb-readline8.2.patch

@@ -0,0 +1,35 @@
+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(-)
+
+diff --git a/gdb/completer.c b/gdb/completer.c
+index d3900ae2014..a51c16ac7f8 100644
+--- 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_throw ()
+       rl_basic_quote_characters = NULL;
+     }
+ 
+-  return rl_completer_word_break_characters;
++  return (char *) rl_completer_word_break_characters;
+ }
+ 
+ char *
+-- 
+2.31.1