add standardlib (#2911)

packages/s/standardlib/xmake.lua

@@ -0,0 +1,24 @@
+package("standardlib")
+
+    set_kind("library", {headeronly = true})
+    set_homepage("https://github.com/gregoryc/standardlib")
+    set_description("an actually usable and maximally efficient C standard library to make C as easy (or easier) than other languages")
+
+    add_urls("https://github.com/gregoryc/standardlib.git")
+    add_versions("2023.12.5", "4fb308a5716927e5622a0488d7aa104660c96841")
+
+    on_install("linux", function (package)
+        os.cp("standardlib.h", package:installdir("include"))
+    end)
+
+    on_test(function (package)
+        assert(package:check_cxxsnippets({test = [[
+            #include "standardlib.h"
+            #include <stdio.h>
+            void test() {
+                const char *text = "This is a sample text";
+                const char *suffix = "text";
+                printf("Does the string end with \"%s\"? %s\n", suffix, ends_with(text, suffix) ? "Yes" : "No");
+            }
+        ]]}))
+    end)