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-headers-4.14.336/patches/winsize.patch

@@ -1,20 +0,0 @@
-SPDX-FileCopyrightText: 2021 fosslinux <fosslinux@aussies.space>
-
-SPDX-License-Identifier: GPL-2.0-only
-
---- include/uapi/asm-generic/termios.h.bak	2021-07-23 14:23:51.330460544 +1000
-+++ include/uapi/asm-generic/termios.h	2021-07-23 19:08:27.112810109 +1000
-@@ -12,13 +12,6 @@
- #include <asm/termbits.h>
- #include <asm/ioctls.h>
- 
--struct winsize {
--	unsigned short ws_row;
--	unsigned short ws_col;
--	unsigned short ws_xpixel;
--	unsigned short ws_ypixel;
--};
--
- #define NCC 8
- struct termio {
- 	unsigned short c_iflag;		/* input mode flags */