remove some addvar

packages/f/ffmpeg/xmake.lua

@@ -12,9 +12,7 @@ package("ffmpeg")
     add_deps("x264", {optional = true})
     add_deps("x265", {optional = true})
 
-    on_load(function (package)
-        package:addvar("links", "avfilter", "avdevice", "avformat", "avcodec", "swscale", "swresample", "avutil")
-    end)
+    add_links("avfilter", "avdevice", "avformat", "avcodec", "swscale", "swresample", "avutil")
 
     on_install("linux", "macosx", function (package)
         local configs = {"--disable-ffmpeg", 

packages/l/libxml2/xmake.lua

@@ -12,10 +12,8 @@ package("libxml2")
         add_deps("autoconf", "automake", "libtool", "pkg-config")
     end
 
-    on_load(function (package)
-        package:addvar("includedirs", "include/libxml2")
-        package:addvar("links", "xml2")
-    end)
+    add_includedirs("include/libxml2")
+    add_links("xml2")
 
     if is_plat("windows") and winos.version():gt("winxp") then
         on_install("windows", function (package)

packages/m/mbedtls/xmake.lua

@@ -12,9 +12,7 @@ package("mbedtls")
         add_deps("cmake")
     end
 
-    on_load(function (package)
-        package:addvar("links", "mbedcrypto", "mbedx509", "mbedtls")
-    end)
+    add_links("mbedcrypto", "mbedx509", "mbedtls")
 
     if is_plat("windows") and winos.version():gt("winxp") then
         on_install("windows", function (package)

packages/n/ncurses/xmake.lua

@@ -8,10 +8,8 @@ package("ncurses")
              "ftp://ftp.gnu.org/gnu/ncurses/ncurses-$(version).tar.gz")
     add_versions("6.1", "aa057eeeb4a14d470101eff4597d5833dcef5965331be3528c08d99cebaa0d17")
 
-    on_load(function (package)
-        package:addvar("includedirs", "include/ncurses", "include")
-        package:addvar("links", "ncurses", "form", "panel", "menu")
-    end)
+    add_includedirs("include/ncurses", "include")
+    add_links("ncurses", "form", "panel", "menu")
 
     on_install("linux", "macosx", function (package)
         import("package.tools.autoconf").install(package, {"--without-manpages"})

packages/t/tbox/xmake.lua

@@ -13,7 +13,7 @@ package("tbox")
 
     on_load(function (package) 
         if package:debug() then
-            package:addvar("defines", "__tb_debug__")
+            package:add("defines", "__tb_debug__")
         end
     end)