initial buildroot for linux 5.15

package/nss-mdns/Config.in

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+config BR2_PACKAGE_NSS_MDNS
+	bool "nss-mdns"
+	# libdaemon->avahi uses fork()
+	depends on BR2_USE_MMU
+	depends on BR2_TOOLCHAIN_USES_GLIBC
+	depends on BR2_PACKAGE_AVAHI_DAEMON
+	help
+	  nss-mdns is a plugin for the GNU Name Service Switch (NSS)
+	  functionality of the GNU C Library (glibc) providing host
+	  name resolution via Multicast DNS (aka Zeroconf, aka Apple
+	  Rendezvous, aka Apple Bonjour), effectively allowing name
+	  resolution by common Unix/Linux programs in the ad-hoc
+	  mDNS domain .local.
+
+	  https://github.com/lathiat/nss-mdns
+
+comment "nss-mdns needs a glibc toolchain"
+	depends on BR2_USE_MMU && BR2_PACKAGE_AVAHI_DAEMON
+	depends on !BR2_TOOLCHAIN_USES_GLIBC

package/nss-mdns/nss-mdns.hash

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+# Locally calculated
+sha256	a2094101b735cade45048764ea594bdae2bfa9399837f3c852a5b264416e9c8c	nss-mdns-0.14.1.tar.gz
+sha256	a9bdde5616ecdd1e980b44f360600ee8783b1f99b8cc83a2beb163a0a390e861	LICENSE

package/nss-mdns/nss-mdns.mk

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+################################################################################
+#
+# nss-mdns
+#
+################################################################################
+
+NSS_MDNS_VERSION = 0.14.1
+NSS_MDNS_SITE = \
+	https://github.com/lathiat/nss-mdns/releases/download/v$(NSS_MDNS_VERSION)
+NSS_MDNS_LICENSE = LGPL-2.1+
+NSS_MDNS_LICENSE_FILES = LICENSE
+NSS_MDNS_CONF_OPTS = --disable-tests
+
+# add mdns4_minimal / mdns around the dns provider if missing
+define NSS_MDNS_INSTALL_CONFIG
+	$(SED) '/^hosts:/ {/mdns4/! s/dns/mdns4_minimal [NOTFOUND=return] dns mdns4/}' \
+		$(TARGET_DIR)/etc/nsswitch.conf
+endef
+
+NSS_MDNS_TARGET_FINALIZE_HOOKS += NSS_MDNS_INSTALL_CONFIG
+
+$(eval $(autotools-package))