initial buildroot for linux 5.15

package/lrzip/Config.in

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+config BR2_PACKAGE_LRZIP
+	bool "lrzip"
+	depends on BR2_USE_MMU # fork()
+	depends on BR2_USE_WCHAR
+	depends on BR2_TOOLCHAIN_HAS_THREADS
+	depends on BR2_INSTALL_LIBSTDCPP
+	select BR2_PACKAGE_ZLIB
+	select BR2_PACKAGE_LZ4
+	select BR2_PACKAGE_LZO
+	select BR2_PACKAGE_BZIP2
+	help
+	  A compression utility that excels at compressing large files
+	  (usually > 10-50 MB). Larger files and/or more free RAM means
+	  that the utility will be able to more effectively compress
+	  your files (ie: faster / smaller size), especially if the
+	  filesize(s) exceed 100 MB. You can either choose to optimise
+	  for speed (fast compression / decompression) or size,
+	  but not both.
+
+	  https://github.com/ckolivas/lrzip
+
+comment "lrzip needs a toolchain w/ wchar, threads, C++"
+	depends on BR2_USE_MMU
+	depends on !BR2_USE_WCHAR || !BR2_TOOLCHAIN_HAS_THREADS || \
+		!BR2_INSTALL_LIBSTDCPP

package/lrzip/lrzip.hash

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+# Locally computed:
+sha256  9b6b4bb1ae76dafbaab96ec9d50d41af5fed45a6c4f2e06feea828c2cd8025c0  lrzip-0.641.tar.gz
+sha256  8177f97513213526df2cf6184d8ff986c675afb514d4e68a404010521b880643  COPYING

package/lrzip/lrzip.mk

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+################################################################################
+#
+# lrzip
+#
+################################################################################
+
+LRZIP_VERSION = 0.641
+LRZIP_SITE = $(call github,ckolivas,lrzip,v$(LRZIP_VERSION))
+LRZIP_AUTORECONF = YES
+LRZIP_LICENSE = GPL-2.0+
+LRZIP_LICENSE_FILES = COPYING
+LRZIP_DEPENDENCIES = zlib lz4 lzo bzip2
+
+ifeq ($(BR2_i386)$(BR2_x86_64),y)
+LRZIP_DEPENDENCIES += host-nasm
+LRZIP_CONF_OPTS += --enable-asm
+else
+LRZIP_CONF_OPTS += --disable-asm
+endif
+
+$(eval $(autotools-package))