lua-cjson: add host build support

patches/openwrt/0046-lua-fix-installation-of-headers-for-host-build.patch

+From: Matthias Schiffer <mschiffer@universe-factory.net>
+Date: Tue, 29 Dec 2015 22:48:52 +0100
+Subject: lua: fix installation of headers for host build
+
+diff --git a/package/utils/lua/Makefile b/package/utils/lua/Makefile
+index 72d5631..c37d99b 100644
+--- a/package/utils/lua/Makefile
++++ b/package/utils/lua/Makefile
+@@ -140,6 +140,7 @@ define Host/Install
+ 	$(MAKE) -C $(HOST_BUILD_DIR) \
+ 		INSTALL_TOP="$(STAGING_DIR_HOST)" \
+ 		install
++	$(CP) $(HOST_BUILD_DIR)/src/lnum_config.h $(STAGING_DIR_HOST)/include/
+ endef
+ 
+ define Build/InstallDev

patches/packages/openwrt/0003-lua-cjson-add-host-build-support.patch

+From: Matthias Schiffer <mschiffer@universe-factory.net>
+Date: Wed, 30 Dec 2015 01:00:49 +0100
+Subject: lua-cjson: add host build support
+
+diff --git a/lang/lua-cjson/Makefile b/lang/lua-cjson/Makefile
+index fd489f2..90c8f98 100644
+--- a/lang/lua-cjson/Makefile
++++ b/lang/lua-cjson/Makefile
+@@ -20,6 +20,7 @@ PKG_MD5SUM:=24f270663e9f6ca8ba2a02cef19f7963
+ 
+ PKG_BUILD_DIR:=$(BUILD_DIR)/$(PKG_NAME)-$(PKG_VERSION)
+ 
++include $(INCLUDE_DIR)/host-build.mk
+ include $(INCLUDE_DIR)/package.mk
+ include $(INCLUDE_DIR)/cmake.mk
+ 
+@@ -39,6 +40,9 @@ endef
+ CMAKE_OPTIONS += \
+ 	-DUSE_LUA=ON
+ 
++CMAKE_HOST_OPTIONS += \
++	-DLUA_MATH_LIBRARY=m
++
+ define Package/lua-cjson/install
+ 	$(INSTALL_DIR) $(1)/usr/lib/lua
+ 	$(INSTALL_BIN) $(PKG_BUILD_DIR)/cjson.so $(1)/usr/lib/lua/
+@@ -47,4 +51,5 @@ define Package/lua-cjson/install
+ 	$(INSTALL_DATA) $(PKG_BUILD_DIR)/lua/cjson/util.lua $(1)/usr/lib/lua/cjson
+ endef
+ 
++$(eval $(call HostBuild))
+ $(eval $(call BuildPackage,lua-cjson))