initial buildroot for linux 5.15

package/libesmtp/Config.in

@@ -0,0 +1,12 @@
+config BR2_PACKAGE_LIBESMTP
+	bool "libesmtp"
+	depends on !BR2_STATIC_LIBS
+	select BR2_PACKAGE_LIBOPENSSL_ENABLE_DES if BR2_PACKAGE_LIBOPENSSL
+	select BR2_PACKAGE_LIBOPENSSL_ENABLE_MD4 if BR2_PACKAGE_LIBOPENSSL
+	help
+	  Library for sending emails through SMTP.
+
+	  https://libesmtp.github.io
+
+comment "libesmtp needs a toolchain w/ dynamic library"
+	depends on BR2_STATIC_LIBS

package/libesmtp/libesmtp.hash

@@ -0,0 +1,4 @@
+# Locally calculated
+sha256  32bc3614ca12d21c7d933f32d43410e8744b6f91fdca7732da9877a385e4e6c3  libesmtp-1.1.0.tar.gz
+sha256  204d8eff92f95aac4df6c8122bc1505f468f3a901e5a4cc08940e0ede1938994  COPYING.GPL
+sha256  20c17d8b8c48a600800dfd14f95d5cb9ff47066a9641ddeab48dc54aec96e331  LICENSE

package/libesmtp/libesmtp.mk

@@ -0,0 +1,27 @@
+################################################################################
+#
+# libesmtp
+#
+################################################################################
+
+LIBESMTP_VERSION = 1.1.0
+LIBESMTP_SITE = $(call github,libesmtp,libESMTP,v$(LIBESMTP_VERSION))
+LIBESMTP_INSTALL_STAGING = YES
+LIBESMTP_LICENSE = GPL-2.0+ (examples), LGPL-2.1+ (library)
+LIBESMTP_LICENSE_FILES = COPYING.GPL LICENSE
+LIBESMTP_CPE_ID_VENDOR = libesmtp_project
+
+ifeq ($(BR2_PACKAGE_OPENSSL),y)
+LIBESMTP_CONF_OPTS += -Dtls=enabled
+LIBESMTP_DEPENDENCIES += openssl
+else
+LIBESMTP_CONF_OPTS += -Dtls=disabled
+endif
+
+ifeq ($(BR2_TOOLCHAIN_HAS_THREADS),y)
+LIBESMTP_CONF_OPTS += -Dpthreads=enabled
+else
+LIBESMTP_CONF_OPTS += -Dpthreads=disabled
+endif
+
+$(eval $(meson-package))