barebox: drop patch file left over during last upgrade

The patch was removed from SRC_URI but not deleted from the directory
tree.

Fixes: 3291a8fa ("barebox: upgrade 2024.10.0 -> 2024.12.0")
(From OE-Core rev: 0a3c4e3550cb52b4f42858ff6cc3356c96f5a6bf)

Signed-off-by: Enrico Jörns <ejo@pengutronix.de>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-bsp/barebox/barebox/0001-lib-lz4-use-lz4-instead-of-lz4c.patch

@@ -1,35 +0,0 @@
-From 24839df617aef8099e4d1ba3fc47a04c52c0cf75 Mon Sep 17 00:00:00 2001
-From: Justin Bronder <jsbronder@cold-front.org>
-Date: Wed, 6 Nov 2024 11:59:40 -0500
-Subject: [PATCH] lib: lz4: use lz4 instead of lz4c
-
-lz4c has been considered deprecated by upstream since at least 2018 [1]
-and has been disabled by default recently [2].  openSUSE Tumbleweed is
-no longer packaging the deprecated version and others will likely
-follow.
-
-Going back as far as Ubuntu 16.04/Fedora 25, both lz4 and lz4c are
-installed as part of the same package so switching should be safe.
-
-1. https://github.com/lz4/lz4/pull/553
-2. https://github.com/lz4/lz4/pull/1479
-
-Upstream-Status: Submitted [http://lists.infradead.org/pipermail/barebox/2024-November/048491.html]
-Signed-off-by: Justin Bronder <jsbronder@cold-front.org>
----
- scripts/Makefile.lib | 2 +-
- 1 file changed, 1 insertion(+), 1 deletion(-)
-
-diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib
-index 1881e3c1..1052bcee 100644
---- a/scripts/Makefile.lib
-+++ b/scripts/Makefile.lib
-@@ -492,7 +492,7 @@ cmd_lzo = (cat $(filter-out FORCE,$^) | \
- 
- quiet_cmd_lz4 = LZ4     $@
- cmd_lz4 = (cat $(filter-out FORCE,$^) | \
--	lz4c -l -c1 stdin stdout && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
-+	lz4 -l --best stdin stdout && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
- 	(rm -f $@ ; false)
- 
- %.lz4: %