add receipe for uhttpd-3p server.

bsp/buildroot_external/package/uhttpd-3p/Config.in

@@ -0,0 +1,20 @@
+menuconfig BR2_PACKAGE_UHTTPD_3P
+	bool "uhttpd (override)"
+	default n
+	help
+		uHTTPd is a tiny single threaded HTTP server with TLS, CGI and Lua
+		support. It is intended as a drop-in replacement for the Busybox
+		HTTP daemon.
+
+if BR2_PACKAGE_UHTTPD_3P
+
+config BR2_PACKAGE_UHTTPD_UBUS_SUPPORT
+	depends on BR2_PACKAGE_UHTTPD_3P
+	select BR2_PACKAGE_JSON_C
+	select BR2_PACKAGE_LIBUBUS_CPP
+	bool "UBus JSON_RPC plugin"
+	default n
+	help
+		Enables remote UBus calls over HTTP
+
+endif

bsp/buildroot_external/package/uhttpd-3p/uhttpd-3p.mk

@@ -0,0 +1,25 @@
+################################################################################
+#
+# UHTTPD_3P
+#
+################################################################################
+
+UHTTPD_3P_VERSION:= 2016.10.25
+
+UHTTPD_3P_SITE =  $(TOPDIR)/../../src/3P/uhttpd/builders/cmake
+UHTTPD_3P_SITE_METHOD = local
+UHTTPD_3P_INSTALL_STAGING = YES
+
+ifeq ($(BR2_PACKAGE_UHTTPD_REST_API_PLUGIN),y)
+UHTTPD_3P_CONF_OPTS += -DREST_API_PLUGING=ON
+endif
+
+ifeq ($(BR2_PACKAGE_UHTTPD_UBUS_SUPPORT),y)
+UHTTPD_3P_CONF_OPTS += -DUBUS_SUPPORT=ON
+endif
+# blobmsg_json crypt json_script
+UHTTPD_3P_DEPENDENCIES = libubox json-c
+
+UHTTPD_3P_CONF_OPTS += -DworkspaceRoot=$(TOPDIR)/../.. -DMODULE_PATH=$(TOPDIR)/../../bsp/cmake-modules -DCMAKE_BUILD_TYPE=$(BUILD_TYPE)
+
+$(eval $(cmake-package))