luasocket: variant for lua5.1 and lua5.3

Updating luasocket package that is compatible with, and built against,
lua version 5.3 and 5.1.

I made the following modifications:

Makefile - Set the LUAV environment variable in the build variant.
Set an include path in the lua build so that that lua headers could
be found. Also using the make install target as everything is put
in the correct place automatically for the lua 5.3 build.
The lua 5.1 build still uses the old install method because when
I was testing using the "install" target the lua5.1 interpreter
was unable to locate resources.  So that is why there are
two install methods.

Built and tested on BCM5301X.

Signed-off-by: Colby Whitney <colby.whitney@luxul.com>

lang/luasocket/Makefile

@@ -22,20 +22,44 @@ PKG_LICENSE_FILES:=LICENSE
 
 include $(INCLUDE_DIR)/package.mk
 
-define Package/luasocket
+define Package/luasocket/default
   SUBMENU:=Lua
   SECTION:=lang
   CATEGORY:=Languages
   URL:=http://w3.impa.br/~diego/software/luasocket
+endef
+
+define Package/luasocket
+  $(Package/luasocket/default)
   TITLE:=LuaSocket
   DEPENDS:=+lua
+  VARIANT:=lua-51
+  DEFAULT_VARIANT:=1
 endef
 
-define Package/luasocket/description
+define Package/luasocket5.3
+  $(Package/luasocket/default)
+  TITLE:=LuaSocket 5.3
+  DEPENDS:=+liblua5.3
+  VARIANT:=lua-53
+endef
+
+ifeq ($(BUILD_VARIANT),lua-51)
+  LUA_VERSION=5.1
+endif
+
+ifeq ($(BUILD_VARIANT),lua-53)
+  LUA_VERSION=5.3
+endif
+
+
+define Package/luasocket/default/description
   LuaSocket is the most comprehensive networking support
   library for the Lua language. It provides easy access to
   TCP, UDP, DNS, SMTP, FTP, HTTP, MIME and much more.
 endef
+Package/luasocket/description     = $(Package/luasocket/default/description)
+Package/luasocket5.3/description = $(Package/luasocket/default/description)
 
 define Build/Configure
 endef
@@ -45,7 +69,7 @@ define Build/Compile
 		LIBDIR="$(TARGET_LDFLAGS)" \
 		CC="$(TARGET_CC) $(TARGET_CFLAGS) $(TARGET_CPPFLAGS) $(FPIC)" \
 		LD="$(TARGET_CROSS)ld -shared" \
-		LUAV=5.1 LUAINC_linux_base=$(STAGING_DIR)/usr/include \
+		LUAV=$(LUA_VERSION) LUAINC_linux_base=$(STAGING_DIR)/usr/include \
 		all
 endef
 
@@ -62,4 +86,14 @@ define Package/luasocket/install
 	ln -sf ../socket-3.0-rc1.so $(1)/usr/lib/lua/socket/core.so
 endef
 
+
+define Package/luasocket5.3/install
+	$(MAKE) -C $(PKG_BUILD_DIR)/src \
+		DESTDIR="$(1)" \
+		LUAV=$(LUA_VERSION) \
+		install
+endef
+
+
 $(eval $(call BuildPackage,luasocket))
+$(eval $(call BuildPackage,luasocket5.3))