Bump buildroot to 2019.02

bsp/buildroot/package/zsh/Config.in

@@ -1,7 +1,6 @@
 config BR2_PACKAGE_ZSH
 	bool "zsh"
 	depends on BR2_USE_MMU # fork()
-	depends on BR2_PACKAGE_BUSYBOX_SHOW_OTHERS
 	select BR2_PACKAGE_NCURSES
 	help
 	  zsh is a shell designed for interactive use, although it is

bsp/buildroot/package/zsh/zsh.hash

@@ -1,7 +1,7 @@
 # From http://www.zsh.org/pub/MD5SUM
-md5	dfe156fd69b0d8d1745ecf6d6e02e047	zsh-5.4.2.tar.gz
+md5	540673bf823d2e13806ac0395caa8345	zsh-5.6.2.tar.xz
 # Calculated based on the hash above and after checking signature
-# http://www.zsh.org/pub/zsh-5.4.2.tar.gz.asc
-sha256	957bcdb2c57f64c02f673693ea5a7518ef24b6557aeb3a4ce222cefa6d74acc9	zsh-5.4.2.tar.gz
+# http://www.zsh.org/pub/zsh-5.6.2.tar.xz.asc
+sha256	a50bd66c0557e8eca3b8fa24e85d0de533e775d7a22df042da90488623752e9e	zsh-5.6.2.tar.xz
 # Locally calculated
 sha256	d06fdf3ef9b1ec69d6b9e170b0a9516fbad3523261ff1668bde3bfea6e0ef5f5  LICENCE

bsp/buildroot/package/zsh/zsh.mk

@@ -4,8 +4,9 @@
 #
 ################################################################################
 
-ZSH_VERSION = 5.4.2
+ZSH_VERSION = 5.6.2
 ZSH_SITE = http://www.zsh.org/pub
+ZSH_SOURCE = zsh-$(ZSH_VERSION).tar.xz
 ZSH_DEPENDENCIES = ncurses
 ZSH_CONF_OPTS = --bindir=/bin
 ZSH_CONF_ENV = zsh_cv_sys_nis=no zsh_cv_sys_nis_plus=no
@@ -34,6 +35,14 @@ else
 ZSH_CONF_OPTS += --disable-pcre
 endif
 
+# Add /bin/zsh to /etc/shells otherwise some login tools like dropbear
+# can reject the user connection. See man shells.
+define ZSH_ADD_ZSH_TO_SHELLS
+	grep -qsE '^/bin/zsh$$' $(TARGET_DIR)/etc/shells \
+		|| echo "/bin/zsh" >> $(TARGET_DIR)/etc/shells
+endef
+ZSH_TARGET_FINALIZE_HOOKS += ZSH_ADD_ZSH_TO_SHELLS
+
 # Remove versioned zsh-x.y.z binary taking up space
 define ZSH_TARGET_INSTALL_FIXUPS
 	rm -f $(TARGET_DIR)/bin/zsh-$(ZSH_VERSION)