Bump buildroot to 2019.02

bsp/buildroot/package/websocketpp/Config.in

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+config BR2_PACKAGE_WEBSOCKETPP
+	bool "websocketpp"
+	depends on BR2_TOOLCHAIN_GCC_AT_LEAST_4_8 # C++11
+	depends on BR2_INSTALL_LIBSTDCPP
+	help
+	  WebSocket++ is a header only C++ library that implements
+	  RFC6455 The WebSocket Protocol. It allows integrating
+	  WebSocket client and server functionality into C++ programs.
+	  It uses interchangeable network transport modules including
+	  one based on C++ iostreams and one based on Boost Asio.
+
+	  http://www.zaphoyd.com/websocketpp
+
+comment "websocketpp needs a toolchain w/ C++ and gcc >= 4.8"
+	depends on !BR2_INSTALL_LIBSTDCPP || !BR2_TOOLCHAIN_GCC_AT_LEAST_4_8

bsp/buildroot/package/websocketpp/websocketpp.hash

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+# Locally Computed:
+sha256  178899de48c02853b55b1ea8681599641cedcdfce59e56beaff3dd0874bf0286  websocketpp-0.8.1.tar.gz
+sha256  b31e597bc777d884a39663c11d0557a0af40780e1f451de11ea5103924a69667  COPYING

bsp/buildroot/package/websocketpp/websocketpp.mk

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+################################################################################
+#
+# websocketpp
+#
+################################################################################
+
+WEBSOCKETPP_VERSION = 0.8.1
+WEBSOCKETPP_SITE = $(call github,zaphoyd,websocketpp,$(WEBSOCKETPP_VERSION))
+WEBSOCKETPP_LICENSE = BSD-3c, MIT, Zlib
+WEBSOCKETPP_LICENSE_FILES = COPYING
+WEBSOCKETPP_INSTALL_STAGING = YES
+# Only installs headers
+WEBSOCKETPP_INSTALL_TARGET = NO
+
+$(eval $(cmake-package))