Upgrade kernel to 4.14.341-openela

This is a continuation of the 4.14 series by the Open Enterprise Linux
Alliance, ostensibly to the same maintenance standards as the now
discontinued kernel.org LTS.

This code is primarily offered as a Git repository, with gz tarballs
also available, but no xz versions. Switching back to a gzipped version
of the kernel source code would introduce too much srcfs growth, so we
use the last kernel.org tar.xz release (4.14.336), and apply OpenELA's
changes using a patch generated from the Git repository.

steps/linux-4.14.336/patches/wno-array-bounds.patch

@@ -1,17 +0,0 @@
-SPDX-FileCopyrightText: 2024 Gábor Stefanik <netrolller.3d@gmail.com>
-
-SPDX-License-Identifier: GPL-2.0-only
-
-Remove -Wno-array-bounds which gcc-4.0.4 doesn't recognize
-
---- drivers/net/ethernet/broadcom/Makefile.bak	2024-02-15 17:05:34.617050047 +0100
-+++ drivers/net/ethernet/broadcom/Makefile	2024-02-15 17:06:06.097047984 +0100
-@@ -16,8 +16,3 @@
- obj-$(CONFIG_BGMAC_PLATFORM) += bgmac-platform.o
- obj-$(CONFIG_SYSTEMPORT) += bcmsysport.o
- obj-$(CONFIG_BNXT) += bnxt/
--
--# FIXME: temporarily silence -Warray-bounds on non W=1+ builds
--ifndef KBUILD_EXTRA_WARN
--CFLAGS_tg3.o += -Wno-array-bounds
--endif