Add buildroot 2018-02

buildroot/package/libassuan/Config.in

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+config BR2_PACKAGE_LIBASSUAN
+	bool "libassuan"
+	depends on BR2_PACKAGE_LIBGPG_ERROR_ARCH_SUPPORTS # libgpg-error
+	depends on BR2_USE_MMU # fork()
+	select BR2_PACKAGE_LIBGPG_ERROR
+	help
+	  Libassuan is a small library implementing the so-called
+	  Assuan protocol.
+
+	  This protocol is used for IPC between most newer GnuPG
+	  components. Both, server and client side functions are
+	  provided.
+
+	  http://www.gnupg.org/related_software/libassuan/

buildroot/package/libassuan/libassuan.hash

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+# From https://www.gnupg.org/download/integrity_check.html
+sha1 c8432695bf1daa914a92f51e911881ed93d50604  libassuan-2.5.1.tar.bz2
+# Locally calculated after checking signature
+# https://www.gnupg.org/ftp/gcrypt/libassuan/libassuan-2.5.1.tar.bz2.sig
+sha256 47f96c37b4f2aac289f0bc1bacfa8bd8b4b209a488d3d15e2229cb6cc9b26449  libassuan-2.5.1.tar.bz2
+sha256 a9bdde5616ecdd1e980b44f360600ee8783b1f99b8cc83a2beb163a0a390e861  COPYING.LIB
+sha256 fc82ca8b6fdb18d4e3e85cfd8ab58d1bcd3f1b29abe782895abd91d64763f8e7  COPYING

buildroot/package/libassuan/libassuan.mk

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+################################################################################
+#
+# libassuan
+#
+################################################################################
+
+LIBASSUAN_VERSION = 2.5.1
+LIBASSUAN_SITE = ftp://ftp.gnupg.org/gcrypt/libassuan
+LIBASSUAN_SOURCE = libassuan-$(LIBASSUAN_VERSION).tar.bz2
+LIBASSUAN_LICENSE = LGPL-2.1+ (library), GPL-3.0 (tests, doc)
+LIBASSUAN_LICENSE_FILES = COPYING.LIB COPYING
+LIBASSUAN_INSTALL_STAGING = YES
+LIBASSUAN_DEPENDENCIES = libgpg-error
+LIBASSUAN_CONF_OPTS = \
+	--with-gpg-error-prefix=$(STAGING_DIR)/usr
+
+$(eval $(autotools-package))