Auto-update libxmake to v2.9.4 (#5158)

* Update libxmake to v2.9.4

* Update xmake.lua

packages/l/libxmake/xmake.lua

@@ -8,6 +8,7 @@ package("libxmake")
              "https://github.com/xmake-io/xmake.git",
              "https://gitlab.com/tboox/xmake.git")
 
+    add_versions("v2.9.4", "75e2dde2bd2a48a332989b801ae65077c452d491fec517a9db27a81c8713cdc5")
     add_versions("v2.9.2", "1f617b6a4568c7eb3e8ab0f3a67c16989245adc547e3a7d1fd861acb308fb5b2")
     add_versions("v2.9.1", "a31dbef8c303aea1268068b4b1ac1aec142ac4124c7cb7d9c7eeb57c414f8d15")
     add_versions("v2.8.9", "5f793c393346ef80e47f083ade4d3c2fdfc448658a7917fda35ccd7bd2b911b8")
@@ -57,7 +58,7 @@ package("libxmake")
 typedef __int8 int8_t;]], '#if defined(_MSC_VER) && (_MSC_VER < 1600)\ntypedef __int8 int8_t;', {plain = true})
         import("package.tools.xmake").install(package, configs)
         os.cp("../xmake", package:installdir("share"))
-        if package:is_plat("linux", "macosx") and package:has_cfuncs("readline", {links = "readline", includes = "readline/readline.h"}) then
+        if package:is_plat("linux", "macosx") and package:has_cfuncs("readline", {links = "readline", includes = {"stdio.h", "readline/readline.h"}}) then
             package:add("syslinks", "readline")
         end
     end)