initial buildroot for linux 5.15

package/xz/Config.in

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+config BR2_PACKAGE_XZ
+	bool "xz-utils"
+	help
+	  XZ is the successor to the Lempel-Ziv/Markov-chain Algorithm
+	  compression format, which provides memory-hungry but
+	  powerful compression (often better than bzip2) and fast,
+	  easy decompression.
+
+	  This package provides the command line tools for working
+	  with XZ compression, including xz, unxz, xzcat, xzgrep, and
+	  so on. They can also handle the older LZMA format, and if
+	  invoked via appropriate symlinks will emulate the behavior
+	  of the commands in the lzma package.
+
+	  https://tukaani.org/xz/

package/xz/xz.hash

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+# Locally calculated after checking pgp signature
+sha256  5117f930900b341493827d63aa910ff5e011e0b994197c3b71c08a20228a42df  xz-5.2.5.tar.bz2
+
+# Hash for license files
+sha256  bcb02973ef6e87ea73d331b3a80df7748407f17efdb784b61b47e0e610d3bb5c  COPYING
+sha256  8177f97513213526df2cf6184d8ff986c675afb514d4e68a404010521b880643  COPYING.GPLv2
+sha256  8ceb4b9ee5adedde47b31e975c1d90c73ad27b6b165a1dcd80c7c545eb65b903  COPYING.GPLv3
+sha256  dc626520dcd53a22f727af3ee42c770e56c97a64fe3adb063799d8ab032fe551  COPYING.LGPLv2.1

package/xz/xz.mk

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+################################################################################
+#
+# xz
+#
+################################################################################
+
+XZ_VERSION = 5.2.5
+XZ_SOURCE = xz-$(XZ_VERSION).tar.bz2
+XZ_SITE = https://tukaani.org/xz
+XZ_INSTALL_STAGING = YES
+XZ_CONF_ENV = ac_cv_prog_cc_c99='-std=gnu99'
+XZ_LICENSE = Public Domain, GPL-2.0+, GPL-3.0+, LGPL-2.1+
+XZ_LICENSE_FILES = COPYING COPYING.GPLv2 COPYING.GPLv3 COPYING.LGPLv2.1
+XZ_CPE_ID_VENDOR = tukaani
+
+ifeq ($(BR2_TOOLCHAIN_HAS_THREADS),y)
+XZ_CONF_OPTS = --enable-threads
+else
+XZ_CONF_OPTS = --disable-threads
+endif
+
+# we are built before ccache
+HOST_XZ_CONF_ENV = \
+	CC="$(HOSTCC_NOCCACHE)" \
+	CXX="$(HOSTCXX_NOCCACHE)"
+
+$(eval $(autotools-package))
+$(eval $(host-autotools-package))