lua: add lua.hpp to InstallDev

This is necessary to build PowerDNS authoritative and recursor against
OpenWRT, and may avoid packages depending on lua/host unnecessarily.

Signed-off-by: James Taylor <james@jtaylor.id.au>

package/utils/lua/Makefile

@@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=lua
 PKG_VERSION:=5.1.5
-PKG_RELEASE:=4
+PKG_RELEASE:=5
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
 PKG_SOURCE_URL:=http://www.lua.org/ftp/ \
@@ -138,6 +138,7 @@ endef
 define Build/InstallDev
 	$(INSTALL_DIR) $(1)/usr/include
 	$(CP) $(PKG_INSTALL_DIR)/usr/include/lua{,lib,conf}.h $(1)/usr/include/
+	$(CP) $(PKG_INSTALL_DIR)/usr/include/lua.hpp $(1)/usr/include/
 	$(CP) $(PKG_INSTALL_DIR)/usr/include/lauxlib.h $(1)/usr/include/
 	$(CP) $(PKG_INSTALL_DIR)/usr/include/lnum_config.h $(1)/usr/include/
 	$(INSTALL_DIR) $(1)/usr/lib