initial buildroot for linux 5.15

package/libuv/Config.in

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+config BR2_PACKAGE_LIBUV
+	bool "libuv"
+	depends on BR2_TOOLCHAIN_HAS_THREADS_NPTL # pthread_barrier_*
+	depends on BR2_USE_MMU # fork()
+	depends on !BR2_STATIC_LIBS
+	depends on BR2_TOOLCHAIN_HAS_SYNC_4
+	help
+	  libuv is a multi-platform support library with a focus
+	  on asynchronous I/O.
+
+	  https://github.com/libuv/libuv
+
+comment "libuv needs a toolchain w/ NPTL, dynamic library"
+	depends on !BR2_TOOLCHAIN_HAS_THREADS_NPTL || BR2_STATIC_LIBS
+	depends on BR2_USE_MMU
+	depends on BR2_TOOLCHAIN_HAS_SYNC_4

package/libuv/libuv.hash

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+# Locally calculated
+sha256  371e5419708f6aaeb8656671f89400b92a9bba6443369af1bb70bcd6e4b3c764  libuv-1.42.0.tar.gz
+sha256  6d20216ae022fbeed23916f48508fd807ece3d8464992330643b0e64e5c0c24b  LICENSE

package/libuv/libuv.mk

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+################################################################################
+#
+# libuv
+#
+################################################################################
+
+# When bumping libuv, check if a new version of uvw is available
+# and bump it too.
+LIBUV_VERSION = 1.42.0
+LIBUV_SITE = $(call github,libuv,libuv,v$(LIBUV_VERSION))
+LIBUV_DEPENDENCIES = host-pkgconf
+LIBUV_INSTALL_STAGING = YES
+LIBUV_AUTORECONF = YES
+LIBUV_LICENSE = BSD-2-Clause, BSD-3-Clause, ISC, MIT
+LIBUV_LICENSE_FILES = LICENSE
+LIBUV_CPE_ID_VENDOR = libuv
+
+# Upstream needs tests to be run sequentially. This is the default in
+# automake 1.11 and before, but not starting in 1.12. To maintain
+# sequentiality in 1.12 and later, the automake option 'serial-tests'
+# must be used, Unfortunately, it is not recognised by 1.11 and
+# before. So upstream only adds it conditionally. We use automake
+# 1.14, so we need it.
+define LIBUV_FIXUP_AUTOGEN
+	echo "m4_define([UV_EXTRA_AUTOMAKE_FLAGS], [serial-tests])" \
+		>$(@D)/m4/libuv-extra-automake-flags.m4
+endef
+LIBUV_POST_PATCH_HOOKS += LIBUV_FIXUP_AUTOGEN
+
+$(eval $(autotools-package))