initial buildroot for linux 5.15

package/libucl/Config.in

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+config BR2_PACKAGE_LIBUCL
+	bool "libucl"
+	help
+	  Universal configuration library parser
+
+	  Libucl is a parser and C API to parse and generate ucl
+	  objects. Libucl consist of several groups of functions:
+	  parser, emitting, conversion, generation, iteration,
+	  validation, and utility. These functions can be used to work
+	  with several formats: JSON, compact JSON, configuration
+	  (nginx like), and YAML. Libucl has clear design that should
+	  be very convenient for reading and writing and makes for an
+	  ideal parser with high performance.
+
+	  https://github.com/vstakhov/libucl

package/libucl/libucl.hash

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+# Locally calculated
+sha256 a6397e179672f0e8171a0f9a2cfc37e01432b357fd748b13f4394436689d24ef  libucl-0.8.1.tar.gz
+sha256 1bf976835764c1d827e07472a0a75adb098682df56681878af05fc0db7439b03  COPYING

package/libucl/libucl.mk

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+################################################################################
+#
+# libucl
+#
+################################################################################
+
+LIBUCL_VERSION = 0.8.1
+LIBUCL_SITE = $(call github,vstakhov,libucl,$(LIBUCL_VERSION))
+LIBUCL_INSTALL_STAGING = YES
+LIBUCL_AUTORECONF = YES
+LIBUCL_LICENSE = BSD-2-Clause
+LIBUCL_LICENSE_FILES = COPYING
+LIBUCL_DEPENDENCIES = host-pkgconf
+
+ifeq ($(BR2_PACKAGE_LIBCURL),y)
+LIBUCL_DEPENDENCIES += libcurl
+LIBUCL_CONF_OPTS += --enable-urls
+else
+LIBUCL_CONF_OPTS += --disable-urls
+endif
+
+$(eval $(autotools-package))